作者:Kazuhiko Sakaguchi、Masato Higashino、Yasufumi Ohfune
DOI:10.1016/s0040-4020(03)00952-9
日期:2003.8
Cationic rearrangement of several α-hydroxysilanes is described. Treatment of both (1R,1′R,2′S)-α-hydroxycyclopropylsilane syn-9 and (1S,1′R,2′S)-anti-9 under aqueous H2SO4 underwent rearrangement via a common α-silyl cation intermediate A to give a mixture of the ring-opened (R)-vinylsilane 13, the tandem [1,2]-CC bond migration product (1R,2S,1′R)-14, and its 1′S isomer 15. On the other hand, the
描述了几种α-羟基硅烷的阳离子重排。两者(1治疗- [R,1' - [R,2'小号)-α-hydroxycyclopropylsilane顺- 9和(1小号,1' - [R,2'小号) -反- 9下含水ħ 2 SO 4后行重排通过一个共同的α -甲硅烷基阳离子中间体甲,得到开环(的混合物[R)-vinylsilane 13,串联[1,2] -CC键迁移的产物(1 - [R,2小号,1' - [R )- 14,及其1 'S异构体15。在另一方面中,(酸性治疗- [R ,ê)-α-hydroxyalkenylsilane 8或(- [R ,Ž) - 8被各具有部分外消旋化相伴,得到烯丙基醇的对映体异构体23经由一个优先顺-facial小号Ñ 2′反应。α-羟基炔基硅烷6和α-羟基烷基硅烷12均对酸性条件呈惰性。然而,在H 2水溶液中处理(R)-α-甲氧基甲炔基硅烷26SO 4给出了具有部分消旋