Medicinal uses of hydrazones

Abstract

Compounds having a structure according to Formula (I): are effective in a method of increasing erythroproietin and vascularization of tissue in a subject in need thereof.

What is claimed is:  
     
         1 . A method of increasing erythropoietin in a mammalian subject in need of such treatment comprising administering to said subject a safe and effective amount of a compound having the structure:  
       
         
           
           
               
               
           
         
       
       wherein 
 (a) R 1  is selected from the group consisting of aryl, cycloalkyl, heteroaryl, and heterocycloalkyl;  
 (b) R 2  is hydrogen when Z is a single covalent bond or nil when Z is a double covalent bond;  
 (c) R 3  is selected from the group consisting of hydrogen and lower alkyl;  
 (d) R 4  is hydrogen when Z is a single covalent bond or nil when Z is a double covalent bond;  
 (e) R 5  is selected from the group consisting of hydrogen and lower alkyl;  
 (f) R 6  is selected from the group consisting of aryl, cycloalkyl, heteroaryl, and heterocycloalkyl;  
 or an optical isomer, diastereomer or enantiomer, or pharmaceutically-acceptable salt, or biohydrolyzable amide, ester, or imide thereof.  
 
     
     
         2 . The method of  claim 1 , wherein: 
 (a) R 1  is selected from aryl or heteroaryl    (b) R 6  is selected from aryl or hetoroaryl    
     
     
         3 . The method of  claim 2 , wherein R 1  is selected from the group consisting of 2-pyridyl, 2-methylphenyl, 2-hydroxyphenyl, 2,4-dihydroxyphenyl, 2-hydroxy-5-hydroxy-methyl-3-methyl-4-pyridyl, 3-hydroxy-3-methoxyphenyl, 6-methyl-2-pyridyl, 2-hydroxy-naphthalene-1-yl, and 3,4-dihydroxyphenyl.  
     
     
         4 . The method of  claim 2 , wherein R 6  is selected from the group consisting of 2-pyridyl, 2-benzothiazole, 2-quinoline, 2-(5.7-bis-trifluoromethyl-[1,8]-napthyridyl), 3-chloro-6-pyridazine, 3-chloro-6-trifluoromethyl-2-pyridyl, 3-chloro-6-trifluoromethyl-2-pyridyl, 4,6-dimethyl-2-pyrimidine, 4-trifluoromethyl-phenyl, 9H-1,3,4,9-tetraaza-2-fluorene, phenyl, 2-(3-chloro-pyrazine), 6-(3-chloro-pyridazine), 1-[(5,6-dimethyl-thieno[2,3-d]pyrimidin-4-yl)], 2-(4,6-di-pyrrolidin-1-yl-[1,3,5]triazinyl), 3-(8-hydroxy-isoquinoline)  
     
     
         5 . The method of  claim 1 , wherein the compound is selected from the group consisting of N-Pyridin-2-yl-N′-(1-pyridin-2-yl-ethylidene)hydrazine, N-methyl-N-pyridin-2-yl-N′-pyridin-2-ylmethylene-hydrazine, N-Pyridin-2-yl-N′-pyridin-2-ylmethyl-hydrazine, N-Methyl-N-pyridin-2-yl-N′-(1-pyridin-2-yl-ethylidene)-hydrazine, N-Benzothiazol-2-yl-N′-pyridin-2-ylmethylene-hydrazine, N-Pyridin-2-ylmethylene-N′-quinolin-2-yl-hydrazine, N-(5,7-Bis-trifluoromethyl-[1,8]naphthyridin-2-yl)-N′-pyridin-2-ylmethylene-hydrazine, N-(6-Chloro-pyridazin-3-yl)-N′-pyridin-2-ylmethylene-hydrazine, N-(3-Chloro-5-trifluoromethyl-pyridin-2-yl)-N′-pyridin-2-yl methylene-hydrazine, N-(3-Chloro-5-trifluoromethyl-pyridin-2-yl)-N-methyl-N′pyridin-2-ylmethylene-hydrazine, N-(4,6-Dimethyl-pyrimidin-2-yl)-N′-(1-pyridin-2-yl-ethylidien)-hydrazine, N-(1-Pyridin-2-yl-ethylidene)-N′-(4-trifluoromethyl-phenyl)-hydrazine, N-Pyridin-2-ylmethylene-N′-(9H-1,3,4,9-tetraaza-fluoren-2-yl)-hydrazine, N-(1-Pyridin-2-yl-ethylidene)-N-(9H-1,3,4,9-tetraaza-fluoren-2-yl)-hydrazine, N-Phenyl-N′-pyridin-2-ylmethylene-hydrazine, N-(2-Methyl-benzylidene)-N′-phenyl-hydrazine, 2-(Phenyl-hydrazonomethyl)-phenol, 2-[(3-Chloro-pyrazin-2-yl)-hydrazonomethyl]-phenol, 2-Pyridyl-(2-hydroxy-benzylidene)-hydrazide, 4-[(3-Chloro-pyrazin-2-yl)-hydrazonomethyl]-benzene-1,3-diol, 5-Hydroxymethyl-2-methyl-4-(pyridin-2-yl-hydrazonomethyl)-3-ol, 2-Methoxy-6-(pyridin-2-yl-hydrazonomethyl)-phenol, 3-(Pyridin-2-yl-hydrazonomethyl)-isoquinolin-8-ol, N-(6-Methyl-pyridin-2-ylmethylene)-N′-pyridin-2-yl-hydrazine, N-(6-Chloro-pyridazin-3-yl)-N′-(6-methyl-pyridin-2-ylmethylene)-hydrazine, 1-[(5,6-Dimethyl-thieno[2,3-d]pyrimidine-4-yl)-methyl]-naphthalen-2-ol, and 4-[(4,6-Di-pyrrolidin-1-yl-[1,3,5]triazin-2-yl)-hydrazonomethyl]-benzene-1,2-diol.