A new synthetic method of 1β-methylcarbapenems utilizing the ketene dithioacetal-terminated cyclization
作者:Osamu Sakurai、Hiroshi Horikawa
DOI:10.1016/0040-4039(96)01785-6
日期:1996.10
Cyclization of alcohols 5 with the ketene dithioacetal terminator into carbapenams 6 was accomplished via the acyliminium ion generated from the corresponding mesylates. Carbapenams 6 were transformed into carbapenem 7 through 1O2-mediated cleavage of the ketene dithioacetal portion, enolphosphorylation, and addition-elimination processes.
用烯酮二硫缩醛终止剂将醇5环化成碳青霉烯6是通过由相应的甲磺酸酯生成的酰基酰亚胺离子实现的。Carbapenams 6转化到碳青霉烯7通过1个Ò 2烯酮二硫缩醛部分,enolphosphorylation,和加成-消除过程的介导的裂解。