Opening of the cephalosporin dihydrothiazine ring.
作者:AKIRA YOSHIDA、SADAO OIDA、EIJI OHKI
DOI:10.1248/cpb.24.362
日期:——
2-Ethoxy-3-cephem-1β-oxide (3) was found to be thermally unstable and easily converted into isothiazolones (4, 5, 6, 9, 10), and the β-lactam derivative (8) under varying reaction conditions. Furthermore, 2-ethoxy-3-cephem (2) was treated with tert-butyl hypochlorite, giving the azetidinone-oxazoline acetate (14).
研究发现,2-乙氧基-3-头孢-1β-氧化物(3)热不稳定,在不同的反应条件下很容易转化成异噻唑酮(4、5、6、9、10)和β-内酰胺衍生物(8)。此外,2-乙氧基-3-头孢(2)经次氯酸叔丁酯处理后,可得到氮杂环丁酮噁唑啉醋酸盐(14)。