| abstract |
The present invention relates to compounds according to the formula I: Where R a is H or an optionally OH-substituted C 1 -C 3 alkyl; R 1 is OR 1 , an optionally substituted C 4-12 carbocyclic group which may be saturated or unsaturated (including aromatic) or an optionally substituted heterocyclic group; R 1 is an optionally substituted C 1 -C 14 hydrocarbyl group or an optionally substituted heterocyclic group; R 2 , R 3 and R 4 are each independently H, an optionally substituted C 1 -C 4 alkyl group (preferably CH 3 , CH 2 CH 3 or CF 3 ), halogen (preferably F, Cl, Br), OR, CN, NO 2 , a C 1 -C 6 thioether, a C 1 -C 6 thioester group, an optionally substituted CO 2 R group, an optionally substituted COR group or an optionally substituted OCOR group (preferably R 4 is H); R is H or an optionally substituted C 1 -C 6 alkyl group; RHET is an optionally substituted heterocyclic group; and pharmaceutically acceptable salts, solvates or polymorphs thereof. |