Synthesis of Silacyclohexanones from Divinylsilanes and Allylamines by a Rh-Catalyzed Cyclization
作者:Jiawei Guo、Song Liu、Qinjiao Pang、Hongyun Zhang、Lu Gao、Li Chen、Zhenlei Song
DOI:10.1021/acs.orglett.1c04183
日期:2022.1.21
An efficient synthesis of silacyclohexanones bearing a variety of silyl substituents has been developed by a [Rh(coe)2Cl]2/PCy3-catalyzed cyclization of divinylsilanes with Jun’s allylamine. The silacyclohexanones can be oxidized with DDQ to give the corresponding silacyclohexadienones, which are further transformed into silicon analog of 2-deoxystreptamine or exo-alkylidenesilacyclohexadienes.
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
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