Process for the production of 7-oxo-4-thia-1-aza-bicyclo ¬3.2.0 hept-2-ene derivatives

摘要

A process for the production of a penem compound I with R being H or an esterifying group, R<1> being H or a protecting group and R<2> being H or a great number of substituents is disclosed with process comprises causing or allowing a compound II to cyclise. Compound II is obtained according to the following reaction scheme.