Penicillin derivatives

摘要

A penicillin derivative represented by the following formula <IMAGE> wherein R1 is hydrogen or trialkylsilyl; R2 is hydrogen, trialkylsilyl or COOR2' wherein R2' is hydrogen, C1-18 alkyl, C2-7 alkoxymethyl, C3-8 alkylcarbonyloxymethyl, C4-9 alkylcarbonyloxyethyl, (C5-7 cycloalkyl)carbonyloxymethyl, C9-14 benzylcarbonyloxyalkyl, C3-8 alkoxycarbonylmethyl, C4-9 alkoxycarbonylethyl, phthalidyl, crotonolacton-4-yl, gamma -butyrolacton-4-yl, halogenated C1-6 alkyl substituted with 1 to 3 halogen atoms, C1-6 alkoxy- or nitro-substituted or unsubstituted benzyl, benzhydryl, tetrahydropyranyl, dimethylaminoethyl, dimethylchlorosilyl, trichlorosilyl, (5-substituted C1-6 alkyl or phenyl or unsubstituted-2-oxo-1,3-dioxoden-4-yl)methyl, C8-13 benzoyloxyalkyl or group for forming a pharmaceutically acceptable salt; and R3 has the same meaning as above R2'.