The first highly enantioselective iridium-catalyzed hydrogenation of cyclicenamines has been developed. This new reaction provided an efficient method for the synthesis of optically active cyclic tertiary amines including natural product crispine A.
On the interaction of silyl triflates with enamines: iminium ion formation versus silylation
作者:Vitalij V. Levin、Alexander D. Dilman、Pavel A. Belyakov、Alexander A. Korlyukov、Marina I. Struchkova、Vladimir A. Tartakovsky
DOI:10.1016/j.tetlet.2005.03.144
日期:2005.5
The interaction of Me3SiOTf and (C6F5)3SiOTf with enamines generating α-silyl-substituted iminium ions is investigated. A trimethylsilyl iminium cation is formed as a long-lived species observable by NMR spectroscopy, whilst the tris(pentafluorophenyl)silyl analogue is very labile and prone to the loss of a proton. On the basis of the latter phenomenon, a method for the synthesis of β-silyl enamines
研究了Me 3 SiOTf和(C 6 F 5)3 SiOTf与生成α-甲硅烷基取代的亚胺离子的烯胺的相互作用。可以通过NMR光谱观察到长寿命的物种是三甲基甲硅烷基亚胺阳离子,而三(五氟苯基)甲硅烷基类似物非常不稳定,容易发生质子损失。基于后一种现象,提出了一种合成β-甲硅烷基烯胺的方法。
Heterocyclic compounds and their production
申请人:Nippon Paint Co., Ltd.
公开号:EP0503958A2
公开(公告)日:1992-09-16
Heterocyclic compounds selected from the group consisting of the compounds [IV] to [VII], [IX] and [X]. The heterocyclic compounds are useful for reactive materials in chemical industry and a process for producing the heterocyclic compounds.