A Practical Synthesis of (+)-Discodermolide and Analogues: Fragment Union by Complex Aldol Reactions
作者:Ian Paterson、Gordon J. Florence、Kai Gerlach、Jeremy P. Scott、Natascha Sereinig
DOI:10.1021/ja011211m
日期:2001.10.1
substrate-controlled, boron-mediated, aldol reactions of the chiral ethyl ketones 10, 11, and 12. Key fragment coupling reactions were a lithium-mediated, anti-selective, aldol reaction of aryl ester 8 (under Felkin-Anh induction from the aldehyde component 9), followed by in situ reduction to produce the 1,3-diol 40, and a (+)-diisopinocampheylboron chloride-mediated aldol reaction of methyl ketone 7 (overturning
(+)-discodermolide (1) 的实用立体控制合成已完成,总产率为 10.3%(最长线性序列为 23 步)。C(1)-C(6) (7)、C(9)-C(16) (8) 和 C(17)-C(24) (9) 亚基的绝对立体化学是通过底物建立的 -手性乙基酮 10、11 和 12 的受控、硼介导的羟醛反应。关键片段偶联反应是芳基酯 8 的锂介导的、抗选择性的羟醛反应(在醛组分的 Felkin-Anh 诱导下) 9),然后原位还原产生 1,3-二醇 40,和 (+)-二异松蒎基氯化硼介导的甲基酮 7 羟醛反应(颠覆醛组分 52 的固有底物诱导)得到( 7S)-加合物 58。