Highly threo-selective ene-reaction of 2-(alkylthio)allyl silyl ethers with aldehydes
作者:Keiji Tanino、Takashi Nakamura、Isan Kuwajima
DOI:10.1016/0040-4039(90)80099-8
日期:——
Under the influence of Mc2A1C1, ene-reaction of 2-(alkylthio)allylsilylethers readily proceeds with a wide range of aldehydes to afford the corresponding γ-hydroxy carbonyl compounds as their enol silylethers with high threo-preference as well as excellent (Z)-selectivity.
Remarkable Stereochemical Features of Ene Reaction of 2-(Alkylthio)crotyl Silyl Ethers Proposal of a Six-Membered Chair-like Transition State
作者:Takashi Nakamura、Keiji Tanino、Isao Kuwajima
DOI:10.1246/cl.1992.1425
日期:1992.8
In the presence of Lewis acid 2-(alkylthio)crotyl silylethers(1) react with aldehydes to give anti or syn adducts with high selectivity, depending on the geometry of 1. Further, on using TiCl4. E-adducts are produced, whereas Z selectivity is observed in the other Lewis acid promoted reactions.
在路易斯酸的存在下,2-(烷硫基)巴豆基甲硅烷基醚(1)与醛反应以产生具有高选择性的反或顺加合物,这取决于 1 的几何形状。此外,使用 TiCl4。产生 E 加合物,而在其他路易斯酸促进的反应中观察到 Z 选择性。