A synthesis of new 3-dialkoxyphosphinylmethyl and 3-dihydroxyphosphinylmethyl cephalosporins.
作者:KIYOHARU NISHIDE、MARIKO YAMAMURA、TAKEO KOBORI、DAIEI TUNEMOTO、KIYOSI KONDO、KIYOSHI SATO
DOI:10.1248/cpb.36.2354
日期:——
The syntheses and the antibacterial activities of new 3-dimethoxyphosphinylmethyl and 3-dihydroxyphosphinylmethyl cephalosporins I-(Z), II-(Z), III-(Z) and III-(E), possessing the chloromethylene or methoxyimino substituent at the α-position to the 7-(2-aminothiazol-4-yl)acetamido or 7-(thiazol-4-yl)acetamido moiety of the cephem nucleus, are described. The key steps of these syntheses were the Michaelis-Arbusov reaction of the 3-halomethylcephem 1 with trimethyl phosphite and the dealkylation reactions of both the dimethoxyphosphinyl group and the p-methoxybenzyl ester of 7a, b-(Z) by treatment with bromotrimethylsilane to afford 9a, b-(Z).
本文介绍了新的 3-二甲氧基膦酰甲基和 3-二羟基膦酰甲基头孢菌素 I-(Z)、II-(Z)、III-(Z) 和 III-(E)的合成和抗菌活性,它们在头孢菌素核的 7-(2-氨基噻唑-4-基)乙酰氨基或 7-(噻唑-4-基)乙酰氨基的 α 位上具有氯亚甲基或甲氧基亚氨基取代基。这些合成的关键步骤是 3-卤甲基头孢环己烷 1 与亚磷酸三甲酯的 Michaelis-Arbusov 反应,以及 7a, b-(Z)的二甲氧基膦酰基和对甲氧基苄酯经溴化三甲基硅烷处理后的脱烷基反应,从而得到 9a, b-(Z)。