2-(Alkylthio)penem-3-carboxylic acids I. Synthesis of 6-unsubstituted penems.
作者:SADAO OIDA、AKIRA YOSHIDA、TERUO HAYASHI、NORIKO TAKEDA、EIJI OHKI
DOI:10.1248/cpb.28.3232
日期:——
Treatment of 4-acetoxy-2-azetidinone (9) with various sodium alkyl trithiocarbonates gave 4-[(alkylthio) thiocarbonyl] thioazetidinones 10, which were converted into the phosphoranes 8. Intramolecular Wittig reactions of 8 followed by deblocking yielded penem-3-carboxylic acids 5.
用各种烷基三硫代碳酸钠处理4-乙酰氧基-2-氮杂环丁酮(9)得到了4-[(烷硫基)硫代羰基]硫代氮杂环丁酮10,这些化合物被转化为磷叶立德8。8的分子内Wittig反应随后进行脱保护反应生成了青霉烯-3-羧酸5。