Optically active silanes were synthesized by a novel asymmetric synthesis which involved the diastereoselective ring-opening reaction of 1,3-dioxa-2-silacycloheptanes bearing a C2 chiral auxiliary with Grignard reagents, followed by a lithium aluminum hydride (LiAlH4) reduction. (R)-Ethylmethylphenylsilane and (R)-methylphenylpropylsilane were derived in 93%ee and 98%ee, respectively. The preparation
The differing modes of reaction of 1-(8-dimethylamino-1-naphthyl)-1-hydrodisilane and 1-(1-naphthyl)-1-hydrodisilane in nickel-catalyzed reactions with acetylene: formation of a pseudo-pentacoordinate silole via SiSi bond cleavage vs. hydrosilation without SiSi bond cleavage
作者:Kohei Tamao、Masahiro Asahara、Atsushi Kawachi
DOI:10.1016/0022-328x(96)06321-8
日期:1996.8
Pseudo-pentacoordinate 1-(8-dimethylamino-1-naphthyl)-1-hydrodisilanes 1 and 2 and the tetracoordinate counterpart 3 have been prepared. In the presence of an Ni(0) complex as catalyst, 1 and 2 undergo degradation to generate a silylene species and a hydrosilane. The complex with Ni of the silylene species from 1 has been trapped with an excess of diphenylacetylene to give a pseudo-pentacoordinate
Asymmetric Synthesis of Silicon Compounds Using Chiral 5,6-Dimethoxy-1,3,2-dioxasilacycloheptane Derivatives
作者:Kimiko Kobayashi、Takayuki Kato、Shinji Masuda
DOI:10.1246/cl.1987.101
日期:1987.1.5
Asymmetric synthesis of siliconcompounds was achieved in high optical yield by the substitution reaction of some chiral 5,6-dimethoxy-1,3,2-dioxasilacycloheptane derivatives with organometallic reagents followed by lithium aluminium hydride reduction. These starting dioxasilacycloheptanes were obtained by the coupling reaction of (S,S)-2,3-dimethoxybutanediol and corresponding prochiral dialkyldichlorosilanes