US2003008847A1PendingUtilityA1

Treatment of diabetes and related pathologies

Assignee: MEDICURE INCPriority: Jul 13, 1999Filed: Aug 8, 2002Published: Jan 9, 2003
Est. expiryJul 13, 2019(expired)· nominal 20-yr term from priority
A61K 31/675A61K 31/64A61K 31/4415A61K 31/5375A61K 31/435A61K 31/44A61K 31/4355A61P 3/10A61K 31/715A61K 45/06
58
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Claims

Abstract

Methods for treating diabetes mellitus and related conditions and symptoms are described. The methods are directed to administering a therapeutically effective amount of a compound. Compounds suitable for the invention include pyridoxal-5′-phosphate, pyridoxal, pyridoxamine, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, or a mixture thereof. Also disclosed are methods directed to concurrently administering a therapeutically effective amount of a compound with other compounds known in the treatment of diabetes mellitus. In one embodiment, a therapeutically effective amount of a compound is administered concurrently with a therapeutically effective amount of insulin. In another embodiment, a therapeutically effective amount of a compound is administered concurrently with a therapeutically effective amount of a hypoglycemic compound.

Claims

exact text as granted — not AI-modified
We claim:  
     
         1 . A method of treating diabetes mellitus in a mammal comprising: administering to the mammal a therapeutically effective amount of a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyidoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         2 . A method according to  claim 1 , wherein the diabetes mellitus treated is insulin-dependent diabetes mellitus.  
     
     
         3 . A method according to  claim 1 , wherein the diabetes mellitus treated is noninsulin-dependent diabetes mellitus.  
     
     
         4 . A method according to  claim 1 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         5 . A method according to  claim 4 , wherein R 1  is phenyl or naphthyl in which phenyl or naphthyl is unsubstituted or substituted by an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, an amino group, a hydroxy group, or an acetyloxy group.  
     
     
         6 . A method according to  claim 4 , wherein the 3-acylated pyridoxal analogue is 2-methyl-3-toluoyloxy-4-formyl-5-hydroxymethylpyridine.  
     
     
         7 . A method according to  claim 4 , wherein the 3-acylated pyridoxal analogue is 2-methyl-3-β-naphthoyloxy-4-formyl-5-hydroxymethylpyridine.  
     
     
         8 . A method according to  claim 1 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         9 . A method according to  claim 8 , wherein R 1  is an alkyl group; an alkoxy group; a dialkylamino group; or phenyl or naphthyl in which phenyl or naphthyl is unsubstituted or substituted by an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, an amino group, a hydroxy group, or an acetyloxy group.  
     
     
         10 . A method according to  claim 8 , wherein R 2  is a group of the formula  
       
         
           
           
               
               
           
         
         wherein R 3  and R 4  are each independently alkyl or when taken together form a ring with the nitrogen atom and which ring may optionally be interrupted by a nitrogen or oxygen atom.  
       
     
     
         11 . A method according to  claim 8 , wherein the 3-acylated pyridoxal analogue is 1-morpholino-1,3-dihydro-7-(p-toluoyloxy)-6-methylfuro(3,4-c)pyridine.  
     
     
         12 . A method according to  claim 8 , wherein the 3-acylated pyridoxal analogue is 1-morpholino-1,3-dihydro-7-(β-naphthoyloxy)-6-methylfuro(3,4-c)pyridine.  
     
     
         13 . A method according to  claim 8 , wherein the 3-acylated pyridoxal analogue is 1-morpholino-1,3-dihydro-7-pivaloyloxy-6-methylfuro(3,4-c)pyridine.  
     
     
         14 . A method according to  claim 8 , wherein the 3-acylated pyridoxal analogue is 1-morpholino-1,3-dihydro-7-(dimethylcarbamoyloxy-6-methylfuro(3,4-c)pyridine.  
     
     
         15 . A method according to  claim 8 , wherein the 3-acylated pyridoxal analogue is 1-morpholino-1,3-dihydro-7-acetylsalicyloxy-6-methylfuro(3,4-c)pyridine.  
     
     
         16 . A method according to  claim 1 , wherein the compound is administered enterally or parenterally.  
     
     
         17 . A method according to  claim 1 , wherein the therapeutically effective amount is in a range of about 0.5-100 mg/kg of the mammal's body weight per day.  
     
     
         18 . A method of treating diabetes mellitus in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of insulin and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         19 . A method according to  claim 18 , wherein the diabetes mellitus treated is insulin-dependent diabetes mellitus.  
     
     
         20 . A method according to  claim 18 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         21 . A method according to  claim 18 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         22 . A method of treating noninsulin-dependent diabetes mellitus in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of a hypoglycemic compound and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         23 . A method according to  claim 22 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         24 . A method according to  claim 22 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         25 . A method according to  claim 22 , wherein the hypoglycemic compound is acarbose, acetohexamide, chlorpropamide, glimepiride, glipizide, glyburide, metformin, tolazamide, tolbutamide, or a mixture thereof.  
     
     
         26 . A method according to  claim 22 , wherein the hypoglycemic compound is tolbutamide.  
     
     
         27 . A method according to  claim 22  further comprising: 
 concurrently administering to the mammal the compound and the hypoglycemic compound in combination with a therapeutically effective amount of insulin.  
 
     
     
         28 . A method of treating insulin resistance in a mammal comprising: administering to the mammal a therapeutically effective amount of a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         29 . A method according to  claim 28 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         30 . A method according to  claim 28 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         31 . A method of treating insulin resistance in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of insulin and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         32 . A method according to  claim 31 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         33 . A method according to  claim 31 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         34 . A method of treating insulin resistance in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of a hypoglycemic compound and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         35 . A method according to  claim 34 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         36 . A method according to  claim 34 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         37 . A method according to  claim 34 , wherein the hypoglycemic compound is acarbose, acetohexamide, chlorpropamide, glimepiride, glipizide, glyburide, metformin, tolazamide, tolbutamide, or a mixture thereof.  
     
     
         38 . A method according to  claim 34 , wherein the hypoglycemic compound is tolbutamide.  
     
     
         39 . A method according to  claim 34  further comprising: 
 concurrently administering to the mammal the compound and the hypoglycemic compound in combination with a therapeutically effective amount of insulin.  
 
     
     
         40 . A method of treating hyperinsulinemia in a mammal comprising: administering to the mammal a therapeutically effective amount of a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         41 . A method according to  claim 40 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         42 . A method according to  claim 40 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         43 . A method of treating hyperinsulinemia in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of insulin and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         44 . A method according to  claim 43 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         45 . A method according to  claim 43 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         46 . A method of treating hyperinsulinemia in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of a hypoglycemic compound and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         47 . A method according to  claim 46 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         48 . A method according to  claim 46 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         49 . A method according to  claim 46 , wherein the hypoglycemic compound is acarbose, acetohexamide, chlorpropamide, glimepiride, glipizide, glyburide, metformin, tolazamide, tolbutamide, or a mixture thereof.  
     
     
         50 . A method according to  claim 46 , wherein the hypoglycemic compound is tolbutamide.  
     
     
         51 . A method according to  claim 46  further comprising: 
 concurrently administering to the mammal the compound and the hypoglycemic compound in combination with a therapeutically effective amount of insulin.  
 
     
     
         52 . A method of treating diabetes-induced hypertension in a mammal comprising: administering to the mammal a therapeutically effective amount of a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         53 . A method according to  claim 52 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         54 . A method according to  claim 52 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         55 . A method of treating diabetes-induced hypertension in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of insulin and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         56 . A method according to  claim 55 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         57 . A method according to  claim 55 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         58 . A method of treating diabetes-induced hypertension in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of a hypoglycemic compound and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         59 . A method according to  claim 58 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         60 . A method according to  claim 58 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         61 . A method according to  claim 58 , wherein the hypoglycemic compound is acarbose, acetohexamide, chlorpropamide, glimepiride, glipizide, glyburide, metformin, tolazamide, tolbutamide, or a mixture thereof.  
     
     
         62 . A method according to  claim 58 , wherein the hypoglycemic compound is tolbutamide.  
     
     
         63 . A method according to  claim 58  further comprising: 
 concurrently administering to the mammal the compound and the hypoglycemic compound in combination with a therapeutically effective amount of insulin.  
 
     
     
         64 . A method of treating diabetes-related damage to blood vessels, eyes, kidneys, nerves, autonomic nervous system, skin, connective tissue, or immune system in a mammal comprising: administering to the mammal a therapeutically effective amount of a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         65 . A method according to  claim 64 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         66 . A method according to  claim 64 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         67 . A method of treating diabetes-related damage to blood vessels, eyes, kidneys, nerves, autonomic nervous system, skin, connective tissue, or immune system in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of insulin and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         68 . A method according to  claim 67 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         69 . A method according to  claim 67 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         70 . A method of treating diabetes-related damage to blood vessels, eyes, kidneys, nerves, autonomic nervous system, skin, connective tissue, or immune system in a mammal comprising: concurrently administering to the mammal a therapeutically effective amount of a combination of a hypoglycemic compound and a compound selected from the group consisting of pyridoxal-5′-phosphate, pyridoxamine, pyridoxal, pyridoxine, a 3-acylated pyridoxal analogue, a pharmaceutically acceptable acid addition salt thereof, and a mixture thereof.  
     
     
         71 . A method according to claim  70 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group.  
 
     
     
         72 . A method according to claim  70 , wherein the 3-acylated pyridoxal analogue is a compound of the formula  
       
         
           
           
               
               
           
         
       
       wherein 
 R 1  is a straight or branched alkyl group, a straight or branched alkenyl group, in which an alkyl or alkenyl group may be interrupted by a nitrogen or oxygen atom; an alkoxy group; a dialkylamino group; or an unsubstituted or substituted aryl group; and  
 R 2  is a secondary amino group.  
 
     
     
         73 . A method according to claim  70 , wherein the hypoglycemic compound is acarbose, acetohexamide, chlorpropamide, glimepiride, glipizide, glyburide, metformin, tolazamide, tolbutamide, or a mixture thereof.  
     
     
         74 . A method according to claim  70 , wherein the hypoglycemic compound is tolbutamide.  
     
     
         75 . A method according to claim  70  further comprising: 
 concurrently administering to the mammal the compound and the hypoglycemic compound in combination with a therapeutically effective amount of insulin.

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