Total synthesis of (±)-α-allokainic acid via two allylsilane N-acyliminium ion reactions
作者:Hendrik H Mooiweer、Henk Hiemstra、W.Nico Speckamp
DOI:10.1016/s0040-4020(01)86407-3
日期:1991.1
A total synthesis of racemic α-allokainic acid is described, which starts from allylsilane 8 and methoxy- or chloroglycine derivative 9, and proceeds fully stereoselectively in nine steps and 1.1% overall yield. Key steps are the intermolecular N-acyliminium ion coupling of 8 with 9 and an intramolecular allylsilane N-acyliminium ion reaction of 4, which closes the pyrrolidine ring by C4-C5 bond formation
描述了外消旋α-链烷酸的全合成,其从烯丙基硅烷8和甲氧基或氯甘氨酸衍生物9开始,并且以九个步骤完全立体选择性地进行,总产率为1.1%。关键步骤是分子间Ñ -acyliminium离子的耦合8与9和分子内烯丙基硅烷Ñ -acyliminium离子反应的4,封闭由C4-C5键形成吡咯烷环。值得注意的是,为了制备δ-内酯5,将8与9偶联的分子内变体未能进行。