Gold-Catalyzed Hydrosilyloxylation Driving Tandem Aldol and Mannich Reactions
作者:Dongjin Kang、Sangjune Park、Taekyu Ryu、Phil Ho Lee
DOI:10.1021/ol301660f
日期:2012.8.3
an enolate from alkyne in the presence of a carbonyl and imine group was realized, which constructed a variety of structural motifs under exceedingly mild reaction conditions in a tandem process. Reaction driving tandem hydrosilyloxylation/aldol reactions was achieved through the formation of enol silyl ethers catalytically generated in situ from readily available alkynes. These reactions were expanded
Synthesis of Benzo[<i>b</i>]siloles via KH-Promoted Cyclization of (2-Alkynylphenyl)silanes
作者:Laurean Ilies、Hayato Tsuji、Eiichi Nakamura
DOI:10.1021/ol9015282
日期:2009.9.3
(2-Alkynylphenyl)silanes undergo intramolecular cyclization in the presence of an excess or a subequimolar amount of potassium hydride to give a variety of new 2-substituted benzosiloles in good to excellent yields. Some of these compounds showed a high fluorescence quantum yield both in solution and in the solid state, and they also showed reversible reduction in THF.
Dihydrosilanes undergo double trans-hydrosilylation with 1,4-diarylbuta-1,3-diynes in the presence of a cationic ruthenium catalyst to afford 2,5-diarylsiloles: in particular, 9-silafluorene is a good hydrosilylating agent to produce spiro-type siloles in good yield.
Tolanes substituted in o-position by -SiHPh2, polymerize intermolecular with H2PtCl6/CH2Cl2 as catalyst, depolymerisation at 350–380 °C/1 torr yields the silaindenes.