Compounds

Abstract

The present invention includes novel compounds useful in the treatment of various disorders in particular infectious diseases, cancer, and allergic diseases and other inflammatory conditions for example allergic rhinitis and asthma, and as vaccine adjuvants.

1 . A method for the treatment of allergic rhinitis, which method comprises administering an effective amount of a compound according to Formula (I): 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt or solvate thereof; wherein
 R 1  is C 1-8 alkylamino, C 1-8 alkoxy, C 3-7 cycloalkylC 1-6 alkylamino, C 3-7 cycloalkylC 1-6 alkoxy, C 1-3 alkoxyC 2-3 alkoxy, or Het b -C 1-3 alkoxy; 
 Het b  is a 5- or 6-membered saturated aliphatic heterocyle containing one oxygen atom; 
 R 2  is —(CH 2 ) n -Het; 
 n is an integer having a value of 1 to 4; 
 Het is a 5- or 6-membered saturated aliphatic heterocycle containing one oxygen heteroatom, which heterocycle may be substituted by one or two C 1-4 alkyl groups. 
 
     
     
         2 . The method according to  claim 1  wherein R 1  is C 1-6 alkylamino, C 1-8 alkoxy, C 3-7 cycloalkylC 1-6 alkylamino, C 3-7 cycloalkylC 1-6 alkoxy, C 1-3 alkoxyC 2-3 alkoxy, or Het b -C 1-3 alkoxy. 
     
     
         3 . The method according to  claim 1  wherein R 1  is n-butoxy, n-butylamino, 2,2-dimethylpentyloxy, n-pentylamino, 3-methylbutoxy, 2-methylbutoxy, 1-methylbutoxy, 2-methylbutylamino, 3-methylbutylamino, 1-methylbutylamino, 2-(cyclopropyl)ethoxy, 2-(ethoxy)ethoxy, (1-methyl-2-methoxy)ethoxy, cyclohexylmethylamino, cyclopentylmethylamino, 2-(cyclopropyl)ethylamino, 2-(methyl)propoxy, cyclohexylmethoxy, methoxyethoxy, (2-tetrahydrofuranyl)methoxy, (2-tetrahydro-2H-pyranyl)methoxy, or 2-(iso-propoxy)ethoxy. 
     
     
         4 . The method according to  claim 1  wherein n is 1. 
     
     
         5 . The method according to  claim 1  wherein n is 2. 
     
     
         6 . The method according to  claim 1  wherein n is 3. 
     
     
         7 . The method according to  claim 1  wherein n is 4. 
     
     
         8 . The method according to  claim 1  wherein n is 1 and Het is tetrahydrofuran-3-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-4-yl, tetrahydrofuran-2-yl, 2,2-dimethyltetrahydro-2H-pyran-4-yl, or tetrahydro-2H-pyran-2-yl. 
     
     
         9 . The method according to  claim 1  wherein n is 2 and Het is tetrahydro-2H-pyran-4-yl, tetrahydrofuran-2-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-2-yl, or tetrahydrofuran-3-yl. 
     
     
         10 . The method according to  claim 1  wherein n is 3 and Het is tetrahydro-2H-pyran-3-yl. 
     
     
         11 . The method according to  claim 1  wherein n is 4 and Het is tetrahydro-2H-pyran-3-yl. 
     
     
         12 . The method according to claim according to  claim 1  wherein R 1  is n-butylamino, n-butoxy, or 2-(cyclopropyl)ethoxy. 
     
     
         13 . The method according to  claim 1  wherein n is 1 and R 2  is tetrahydro-2H-pyran-4-yl or tetrahydrofuran-3-yl. 
     
     
         14 . The method according to  claim 1  wherein R 1  is n-butylamino, n-butoxy, (R)-1-methylbutyloxy, (S)-1-methylbutyloxy, or 2-(cyclopropyl)ethoxy. 
     
     
         15 . The method according to  claim 1  wherein Het is tetrahydrofuran-3-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-4-yl, tetrahydrofuran-2-yl, 2,2-dimethyltetrahydro-2H-pyran-4-yl, or tetrahydro-2H-pyran-2-yl. 
     
     
         16 . The method according to  claim 1  wherein Het is tetrahydro-2H-pyran-4-yl, tetrahydrofuran-2-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-2-yl, or tetrahydrofuran-3-yl. 
     
     
         17 . The method according to  claim 1  wherein Het is tetrahydro-2H-pyran-3-yl. 
     
     
         18 . The method according to  claim 1  wherein Het is tetrahydro-2H-pyran-3-yl. 
     
     
         19 . The method according to  claim 1  wherein Het is tetrahydro-2H-pyran-4-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-2-yl, 2,2-dimethyltetrahydro-2H-pyran-4-yl, tetrahydrofuran-3-yl, or tetrahydro-2H-pyran-2-yl. 
     
     
         20 . The method according to  claim 1  wherein n is 2 and Het is tetrahydro-2H-pyran-4-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-2-yl, 2,2-dimethyltetrahydro-2H-pyran-4-yl, tetrahydrofuran-3-yl, or tetrahydrofuran-2-yl. 
     
     
         21 . The method according to  claim 1  wherein n is 3 and Het is tetrahydro-2H-pyran-4-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-2-yl, 2,2-dimethyltetrahydro-2H-pyran-4-yl, tetrahydrofuran-3-yl, or tetrahydrofuran-2-yl. 
     
     
         22 . The method according to  claim 1  wherein n is 4 and Het is tetrahydro-2H-pyran-4-yl, tetrahydro-2H-pyran-3-yl, tetrahydro-2H-pyran-2-yl, 2,2-dimethyltetrahydro-2H-pyran-4-yl, tetrahydrofuran-3-yl, or tetrahydrofuran-2-yl. 
     
     
         23 . The method according to  claim 1  wherein said compound is selected from the list consisting of:
 6-amino-2-butoxy-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butoxy-9-(tetrahydro-2H-pyran-2-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butoxy-9-(tetrahydrofuran-2-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-(tetrahydro-2H-pyran-2-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-(tetrahydrofuran-2-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-[2-(tetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-(tetrahydrofuran-3-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-(tetrahydro-2H-pyran-3-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butoxy-9-(tetrahydrofuran-3-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butoxy-9-[2-(tetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butoxy-9-(tetrahydro-2H-pyran-3-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butoxy-9-[2-(tetrahydrofuran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-[2-(tetrahydrofuran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butoxy-9-[2-(tetrahydro-2H-pyran-3-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-[2-(tetrahydro-2H-pyran-3-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2,2-dimethylpentyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(pentylamino)-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(3-methylbutyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-methylbutyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(1-methylbutyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-methylbutyl)amino]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(3-methylbutyl)amino]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(1-methylbutyl)amino]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butyloxy-9-[2-(tetrahydro-2H-pyran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butyloxy-9-[(2,2-dimethyltetrahydro-2H-pyran-4-yl)methyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[(2,2-dimethyltetrahydro-2H-pyran-4-yl)methyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butyloxy-9-[2-(tetrahydro-3-furanyl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[2-(tetrahydro-2H-pyran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[2-(tetrahydro-3-furanyl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[2-(ethyloxy)ethyl]oxy}-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[1-methyl-2-(methoxy)ethyl]oxy}-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[2-(ethyloxy)ethyl]oxy}-9-(tetrahydro-2H-pyran-3-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[1-methyl-2-(methoxy)ethyl]oxy}-9-(tetrahydro-2H-pyran-3-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(cyclohexylmethyl)amino]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(cyclopentylmethyl)amino]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)amino]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-methylpropyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(cyclohexylmethyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[2-(methoxy)ethyl]oxy}-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[2-(methoxy)ethyl]oxy}-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(tetrahydro-2-furanylmethyl)oxy]-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[3-(tetrahydro-2H-pyran-3-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-9-(tetrahydro-2H-pyran-4-ylmethyl)-2-[(tetrahydro-2H-pyran-2-ylmethoxy]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-({2-[(1-methylethyl)oxy]ethyl}oxy)-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[4-(tetrahydro-2H-pyran-3-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)amino]-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)amino]-9-(tetrahydro-2H-pyran-3-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one, 
 
       and pharmaceutically acceptable salts or solvates thereof. 
     
     
         24 . The method according to  claim 1  wherein said compound is selected from the list consisting of:
 6-amino-2-(butyloxy)-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-(tetrahydro-2H-pyran-4-ylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-(tetrahydro-3-furanylmethyl)-7,9-dihydro-8H-purin-8-one, 
 
       and pharmaceutically acceptable salts or solvates thereof. 
     
     
         25 . The method according to  claim 1  wherein said compound is selected from the list consisting of:
 6-amino-2-butoxy-9-[2-(tetrahydrofuran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butylamino-9-[2-(tetrahydro-2H-pyran-3-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butyloxy-9-[2-(tetrahydro-2H-pyran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-butyloxy-9-[(2,2-dimethyltetrahydro-2H-pyran-4-yl)methyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[3-(tetrahydro-2-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[4-(tetrahydro-2-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-{2-[(3S)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-{2-[(3R)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[3-(tetrahydro-3-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[4-(tetrahydro-3-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[3-(tetrahydro-2H-pyran-2-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[4-(tetrahydro-2H-pyran-2-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[2-(2,2-dimethyltetrahydro-2H-pyran-4-ylethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[3-(2,2-dimethyltetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butylamino)-9-[4-(2,2-dimethyltetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[3-(tetrahydro-2-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[4-(tetrahydro-2-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-{2-[(3S)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-{2-[(3R)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[3-(tetrahydro-3-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[4-(tetrahydro-3-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[3-(tetrahydro-2H-pyran-2-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[4-(tetrahydro-2H-pyran-2-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[3-(tetrahydro-2H-pyran-3-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[4-(tetrahydro-2H-pyran-3-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[2-(2,2-dimethyltetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[3-(2,2-dimethyltetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[4-(2,2-dimethyltetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[2-(tetrahydro-2-furanyl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[3-(tetrahydro-2-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[4-(tetrahydro-2-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[2-(tetrahydro-3-furanyl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-{2-[(3S)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-{2-[(3R)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[3-(tetrahydro-3-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[4-(tetrahydro-3-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[2-(tetrahydro-2H-pyran-2-ylethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[3-(tetrahydro-2H-pyran-2-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[4-(tetrahydro-2H-pyran-2-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[2-(tetrahydro-2H-pyran-3-ylethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[4-(tetrahydro-2H-pyran-3-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[2-(tetrahydro-2H-pyran-4-ylethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[2-(2,2-dimethyltetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[3-(2,2-dimethyltetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[4-(2,2-dimethyltetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2-furanyl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[3-(tetrahydro-2-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-{2-[(3S)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-{2-[(3R)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[3-(tetrahydro-3-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[4-(tetrahydro-3-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2H-pyran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[3-(tetrahydro-2H-pyran-2-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[4-(tetrahydro-2H-pyran-2-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2H-pyran-3-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[4-(tetrahydro-2H-pyran-3-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-9-[2-(2,2-dimethyltetrahydro-2H-pyran-4-yl)ethyl]-2-{[(1S)-1-methylbutyl]oxy}-7,9-dihydro-8H-purin-8-one; 
 6-amino-9-[3-(2,2-dimethyltetrahydro-2H-pyran-4-yl)propyl]-2-{[(1S)-1-methylbutyl]oxy}-7,9-dihydro-8H-purin-8-one; 
 6-amino-9-[4-(2,2-dimethyltetrahydro-2H-pyran-4-yl)butyl]-2-{[(1S)-1-methylbutyl]oxy}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2-furanyl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[3-(tetrahydro-2-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-{2-[(3S)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-{2-[(3R)-tetrahydro-3-furanyl]ethyl}-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[3-(tetrahydro-3-furanyl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[4-(tetrahydro-3-furanyl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2H-pyran-2-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[3-(tetrahydro-2H-pyran-2-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[4-(tetrahydro-2H-pyran-2-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2H-pyran-3-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[4-(tetrahydro-2H-pyran-3-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1R)-1-methylbutyl]oxy}-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-9-[2-(2,2-dimethyltetrahydro-2H-pyran-4-yl)ethyl]-2-{[(1R)-1-methylbutyl]oxy}-7,9-dihydro-8H-purin-8-one; 
 6-amino-9-[3-(2,2-dimethyltetrahydro-2H-pyran-4-yl)propyl]-2-{[(1R)-1-methylbutyl]oxy}-7,9-dihydro-8H-purin-8-one; 
 6-amino-9-[4-(2,2-dimethyltetrahydro-2H-pyran-4-yl)butyl]-2-{[(1R)-1-methylbutyl]oxy}-7,9-dihydro-8H-purin-8-one; 
 
       and pharmaceutically acceptable salts and solvates thereof. 
     
     
         26 . The method according to  claim 1  wherein said compound is selected from the list consisting of:
 6-amino-2-(butyloxy)-9-[4-(tetrahydro-2H-pyran-3-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-(butyloxy)-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[2-(tetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[3-(tetrahydro-2H-pyran-4-yl)propyl]-7,9-dihydro-8H-purin-8-one, and; 
 6-amino-2-{[(1S)-1-methylbutyl]oxy}-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[2-(tetrahydro-2H-pyran-4-yl)ethyl]-7,9-dihydro-8H-purin-8-one, and; 
 6-amino-2-[(2-cyclopropylethyl)oxy]-9-[4-(tetrahydro-2H-pyran-4-yl)butyl]-7,9-dihydro-8H-purin-8-one; 
 
       and pharmaceutically acceptable salts or solvates thereof.