Process for preparing 2-exo-methylène-penam derivatives.

摘要

The present invention provides a process for preparing a 2-exo-methylenepenam derivative represented by the formula (2), the process being characterized by reacting an allenyl beta -lactam compound represented by the formula (1) with a metallic reducing agent, in which R<1>, R<2>, R<3> and X are defined in the specification. <CHEM> n