在这项研究中,我们证明了烷基五氟硅酸钾(RSiF 5 K 2)是选择性C(sp 3)–C(sp 3)键形成反应的有效伯烷基自由基前体。RSiF 5 K 2试剂是白色的,可自由流动的固体,对湿气和空气稳定。这类试剂可在温和条件下通过单电子转移将四氢异喹啉直接C-1烷基化。在该转化中,烷基五氟硅酸盐和四氢异喹啉都具有宽泛的底物范围。自由基清除剂和EPR捕获实验均表明,主要自由基是由RSiF 5 K 2的氧化产生的。提出了一种机制,该机制涉及将烷基自由基加到亚胺盐中,然后用胺还原。
Trichlorosilyl groups containing organochlorosilanes and their preparation methods by the double-silylation of olefins with trichlorosilane
申请人:KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
公开号:US20040082803A1
公开(公告)日:2004-04-29
The present invention provides organosilicon compounds containing two trichlorosilyl groups and their preparation methods. Organosilicon compounds of formula II are prepared by reacting linear chain or cyclic olefins of formula I with trichlorosilane in the presence of quaternary organophosphonium salt as a catalyst.
R
1
—HC═CH—R
2
(I)
1
In formulas I and II, R
1
and R
2
may be identical or different and represent a hydrogen atom, a linear or a cyclic C
1
-C
8
alkyl, a linear or a cyclic C
1
-C
8
alkenyl, benzyl, phenyl, a C
1
-C
8
alkyl substituted phenyl group, two functional groups between R
1
and R
2
may be covalently bonded to form a C
4
-C
8
ring with or without a carbon-carbon double bond.
Effect of the substituents at the silicon of (ω-chloroalkyl)silanes on the alkylation to benzene
作者:Bok Ryul Yoo、Jeong Hyun Kim、Ho-Jin Lee、Kang-Bong Lee、Il Nam Jung
DOI:10.1016/s0022-328x(00)00319-3
日期:2000.7
n=1–3] underwent Friedel–Crafts alkylation with benzene in the presence of aluminum chloride to give alkylated products. Such alkylation reactions took place at temperatures ranging from room temperature (m=0–1, n=2, 3; m=3, n=1) to 80 (m=1, 2; n=1) and 200°C (m=0; n=1), depending on the substituent(s) of the silicon and the alkylene-chain spacer between the silicon and CCl bond of (ω-chloroalkyl)silanes
The enantioselective construction of silicon-stereocenter by asymmetric enamine catalysis is reported. The reaction proceeds via an unprecedented desymmetric intramolecular aldolization of prochiral siladials for the diverse synthesis of multifunctional silicon-stereogenic silacycles.