Organofluorosilicates in Organic Synthesis. XVI. Synthesis of Organopentafluorosilicates<i>via</i>the Diels-Alder, Ene, and Friedel-Crafts Reaction. Their Transformations to Organic Halides and Alcohols
作者:Kohei Tamao、Jun-ichi Yoshida、Munetaka Akita、Yoshihiro Sugihara、Takahisa Iwahara、Makoto Kumada
DOI:10.1246/bcsj.55.255
日期:1982.1
Described herein are several representative examples of cleavage reactions of otherwise hardly accessible organopentafluorosilicates which are obtainable via the Diels-Alder reaction, ene reaction, and the Friedel-Crafts reaction of vinyl-, ethynyl-, or allyl-trichlorosilanes. The Diels-Alder reaction between vinyltrichlorosilane and o-xylylene generated in situ by debromination of α,α′-dibromo-o-xylene
本文中描述了一些否则难以获得的有机五氟硅酸盐的裂解反应的代表性实例,其可通过乙烯基-、乙炔基-或烯丙基-三氯硅烷的狄尔斯-阿尔德反应、烯反应和弗瑞德-克来福特反应获得。乙烯基三氯硅烷与邻二甲苯之间的 Diels-Alder 反应是通过 α,α'-二溴-邻二甲苯脱溴产生的(1,2,3,4-四氢-2-萘基)三氯硅烷,后者被转化为相应的硅酸盐。硅酸盐与 NBS 和 MCPBA 反应得到相应的溴化物和醇。乙炔基三氯硅烷和香豆酸甲酯之间的 Diels-Alder 反应产生了比例为 55/45 的(三氯甲硅烷基)苯甲酸甲酯的间位和对位异构体的混合物,其硅酸盐与 NBS 反应生成溴苯甲酸甲酯的两种位置异构体。甲氧基羰基对 Si-C 键断裂的电子效应很小。衍生自4-辛烯基三氯硅烷的硅酸盐...