Penem derivatives, their preparation and pharmaceutical compositions containing them

摘要

Penem derivatives of general formula (I), below, and pharmaceutically acceptable salts thereof are disclosed. <IMAGE> (I) wherein: R1 is H, C1-C6 alkoxy, C3-C7 cycloalkyl, or an optionally protected C1-C6 hydroxyalkyl; R2 is a free or esterified carboxyl group or a carboxylate anion; R3 is H or C1-C6 alkyl; R4 is H, C1-C6 alkyl, C1-C6 hydroxyalkyl, C1-C6 mercaptoalkyl, C1-C6 aminoalkyl, C1-C6 alkyl substituted by a quaternary ammonium group, C1-C6 carboxyalkyl, cycloalkyl, aryl, arylalkyl, heterocyclyl-alkyl optionally substituted, saturated or unsaturated heterocycle, or R3 and R4 are linked together to form a heterocyclic ring having 3-7 atoms; R5 and R6 independently are H, C1-C6 alkyl, C1-C6 hydroxyalkyl, C1-C6 mercaptoalkyl, C-C6 aminoalkyl, alkenyl, cycloalkyl, aryl, arylalkyl, alkylaryl, heterocyclyl-alkyl, C1-C6 alkyl carboxyamide, or R5 and R6 are taken together to form a heterocyclic ring having 3-7 atoms, and n is an intiger from 1 to 3.