作者:Stephen G. Davies、A. Christopher Garner、Rebecca L. Nicholson、James Osborne、Paul M. Roberts、Edward D. Savory、Andrew D. Smith、James E. Thomson
DOI:10.1039/b902753j
日期:——
The doubly diastereoselective [3,3]-sigmatropic aza-Claisen rearrangement of silylketene aminals derived from 5-substituted (3S,4E,αR)-1-benzyloxy-3-[N-acyl-N-(α-methylbenzyl)amino]pent-4-enes furnishes 2,3-disubstituted (R)-N-α-methylbenzyl (2S,3R,4E)-7-benzyloxyhept-4-enamides in >90% de under the “matched” control of both stereogenic centres. Rearrangement of the “mismatched” diastereomeric (3R,4E,αR)-substrates proceeds with low diastereoselectivity. The substrate scope of the doubly diastereoselective rearrangement of the “matched” substrates in which two new stereogenic centres are created has been delineated.
衍生自 5-取代 (3S,4E,αR)-1-苄氧基-3-[N-酰基-N-(α-甲基苄基)氨基]的甲硅烷基乙烯酮缩醛的双非对映选择性 [3,3]-σ 氮杂克莱森重排戊-4-烯在两个立体中心的“匹配”控制下提供 >90% de 的 2,3-二取代 (R)-N-α-甲基苄基 (2S,3R,4E)-7-苄氧基庚基-4-烯酰胺。 “不匹配的”非对映异构体 (3R,4E,αR) 底物的重排以低非对映选择性进行。已经描绘了“匹配”底物的双非对映选择性重排的底物范围,其中创建了两个新的立体中心。