Catalytic Enantioselective Synthesis of (−)-Prostaglandin E<sub>1</sub> Methyl Ester Based on a Tandem 1,4-Addition−Aldol Reaction
作者:Leggy A. Arnold、Robert Naasz、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/jo025987x
日期:2002.10.1
catalyst result in highly functionalized cyclopentane building blocks with ee's up to 97%. A new synthesis of cyclopentene-3,5-dione monoacetals is presented as well as its use in a tandem 1,4-addition-aldol protocol for the catalytic asymmetric total synthesis of (-)-PGE(1) methyl ester. This synthesis represents a new approach to this class of natural products. By using only 3 mol % of an enantiomerically
在原位生成的Cu(OTf)(2)/手性亚磷酰胺催化剂的存在下,二烷基锌试剂与环戊烯3,5-二酮单缩醛的催化对映选择性1,4-加成和串联1,4-加成-羟醛反应导致高度实用的环戊烷构建基,ee高达97%。介绍了环戊烯3,5-二酮单缩醛的一种新合成方法,以及它在串联1,-加成-醛醇规程中用于(-)-PGE(1)甲酯催化不对称全合成的用途。这种合成代表了这类天然产物的新方法。通过在关键步骤中仅使用3 mol%的对映体纯催化剂,可以立即建立PGE(1)基本结构的三个立体中心的绝对构型。