The Reactivity of Epoxides with Lithium 2,2,6,6-Tetramethylpiperidide in Combination with Organolithiums or Grignard Reagents
作者:David M. Hodgson、Matthew J. Fleming、Steven J. Stanway
DOI:10.1021/jo070291v
日期:2007.6.1
2-disubstituted epoxides in the presence of LTMP to generate alkenes in a completely regio- and highlystereoselective manner. Arylated alkenes, dienes, allylsilanes, and enynes are accessed using this procedure. The methodology is applied in the synthesis of the roller leaf moth pheromone, (3E,5Z)-dodecadienyl acetate. The corresponding reaction without LTMP has also been examined, and a study using deuterated
derivatives play pivotal roles across diverse applications, yet their current synthetic methods often entail intricate functional group manipulations. Despite the widespread use of allyl silanes as carbon nucleophiles in organic synthesis, their participation in allylic C–H functionalization has been underexplored. Herein, we unveil a metal-free intermolecular C–H amination of allyl silanes facilitated
Synthesis of Z-allylsilanes in high or good yields and with good stereoselectivity is achieved from O-acetylated 1-silyl-3-chloro alcohols promoted by SmI2. The starting compounds were easily prepared from 2-chloroaldehydes and a mechanism is proposed to explain the stereoselectivity of the β-elimination reaction.
Reaction of Allyltrimethylsilanes with iodosylbenzene and trimethylsilyl azide in dichloromethane at -78 °C to room temperature affords vicinal diazides, which undergo fluoride ion-catalyzed β-elimination of azide and trimethylsilyl groups, providing allyl azides in good yields.
在 -78 °C 至室温条件下,烯丙基三甲基硅烷与碘代苯和三甲基硅叠氮化物在二氯甲烷中发生反应,生成邻位重氮化物,这些重氮化物在氟离子催化下发生叠氮基和三甲基硅基的β-消除反应,从而以良好的收率生成烯丙基叠氮化物。