申请人:ELI LILLY AND COMPANY
公开号:EP0359540A2
公开(公告)日:1990-03-21
The invention provides a free radical process for preparing 1-carba(1-dethia)cephalosporin antibiotics with 2-substituted methylcephalosporin 1,1-dioxides wherein the substituent on the 2-methylene group is a free radical precursor group such as a phenyl or alkylseleno group. The latter dioxides are treated with a free radical initiator, e.g., a trialkyltin hydride or actinic radiation at 40°C to 150°C to provide the 1-carba-3-cephem and 1-carba-2-cephem products. The invention also provides free radical compounds formed as intermediates in the process.
本发明提供了一种用 2-取代甲基头孢菌素 1,1-二氧杂环戊烯制备 1-carba(1-dethia)头孢菌素抗生素的自由基工艺,其中 2-亚甲基上的取代基为自由基前体基团,如苯基或烷基硒基。用自由基引发剂(如氢化三烷基锡)或光辐射在 40°C 至 150°C 下处理后一种二氧 化物,可得到 1-carba-3-cephem 和 1-carba-2-cephem产物。本发明还提供了在此过程中作为中间体形成的自由基化合物。