6-(SUBSTITUTED METHYLENE) PENEMS AND INTERMEDIATES

摘要

COMPOUNDS OF FORMULA (1)(FORMULA 1)IN WHICH: R1 IS HYDROGEN OR AN ORGANIC SUBSTITUENT GROUP;@R2 IS A FUSED BICYCLIC HETEROCYCLIC RING SYSTEM OF GENERAL FORMULA :(FORMULA 2)WHEREIN R4 AND R5 ARE INDEPENDENTLY HYDROGEN OR ONE OR MORE SUBSTITUENTS REPLACING HYDROGEN ATOMS IN THE RING SYSTEM SHOWN; M IS 2 OR 3; P IS ZERO, 1 OR 2; AND R3 IS HYDROGEN, A SALT - FORMING CATION OR AN ESTER - FORMING GROUP; AND THE SYMBOL =/= INDICATES THAT THE DOUBLE BOND MAY BE IN EITHER THE E OR Z CONFIGURATION.