A New Magnesium-Catalyzed Doubly Diastereoselective <i>anti</i>-Aldol Reaction Leads to a Highly Efficient Process for the Total Synthesis of Lactacystin in Quantity
作者:E. J. Corey、Weidong Li、Gregory A. Reichard
DOI:10.1021/ja973444c
日期:1998.3.1
is described for metal-catalyzed doubly diastereoselective Mukaiyama aldol coupling of a chiral tertiary α-amino aldehyde and an achiral silyl enol ether to form selectively an anti-aldol product. The metal requirement is strict, since of several salts tested only MgI2 functions as an effective catalyst. The MgI2-catalyzed aldol greatly facilitates the total synthesis of lactacystin (1) and the corresponding
描述了一种用于金属催化双非对映选择性 Mukaiyama 羟醛偶联手性叔 α-氨基醛和非手性甲硅烷基烯醇醚以选择性形成抗羟醛产物的新方法。金属要求很严格,因为在测试的几种盐中,只有 MgI2 作为有效催化剂起作用。MgI2 催化的羟醛极大地促进了乳胞素 (1) 和相应的 β-内酯 (2) 的全合成,这些微生物产物是蛋白酶体功能、细胞周期进程和基因调控的有效和选择性抑制剂。该方法还允许合成 1 的类似物,其中乳胱氨酸的 7β-甲基被高级烷基或芳烷基取代。