Oxadiazines & related compounds.

摘要

Compounds of the formula (V), <CHEM> wherein R<1> is certain optionally substituted alkyl groups, R<2> is hydrogen, alkyl or optionally substituted phenyl and R<3> and R<4> are independently alkyl or optionally substituted phenyl, or together form a C 4-7 cycloalkyl ring; are described as useful intermediates in the preparation of carbapenem and penem antibiotics. Processes for their preparation are described as are certain oxadiazine intermediates.