Yoshida Akira C O Sankyo Compa, Oda Kozo C O Sankyo Company Li: Process for preparing carbapenem and penem compounds and new compounds involved in that process.. Sankyo, March 16, 1994: EP0587436-A1 (1 worldwide citation)

Penem and carbapenem compounds having a group of formula -SA are prepared from a corresponding compound having a substituted thio, sulphinyl or sulphonyl group at this position by reaction with a compound ASH (where A is various organic groups) in the presence of a salt of a metal of Group II or III ...