Synthesis of β-branched Morita–Baylis–Hillman-type adducts from 1,3-diaryl-2-propynyl trimethylsilyl ethers and aldehydes catalyzed by potassium tert-butoxide
作者:Kazuhiro Yoshizawa、Takayuki Shioiri
DOI:10.1016/j.tetlet.2005.11.118
日期:2006.1
1,3-Diaryl-2-propynyl trimethylsilyl ethers were easy to isomerize into the corresponding siloxyallenes using a catalytic amount of potassiumtert-butoxide under very mild conditions. The siloxyallenes reacted in situ with various aldehydes to afford Z-selective β-branched Morita–Baylis–Hillman-type adducts in a one-pot reaction after acid treatment.
Catalytic Deprotonative Functionalization of Propargyl Silyl Ethers with Imines
作者:Hiroshi Naka、Daiki Koseki、Yoshinori Kondo
DOI:10.1002/adsc.200800281
日期:2008.8.4
A metal-free, catalytic CH functionalization of propargylsilylethers with imines using the phosphazene base (t-Bu-P4 base) provides structurally defined multisubstituted pyrroles in modest to excellent yields under mild conditions. A one-pot, three-component reaction using silylated acetylenes, aldehydes, and imines is also presented.
Convenient stereoselective synthesis of (Z)-chalcone derivatives from 1,3-diaryl-2-propynyl silyl ethers
作者:Kazuhiro Yoshizawa、Takayuki Shioiri
DOI:10.1016/j.tetlet.2006.05.021
日期:2006.7
Various (Z)-chalcone derivatives were easily synthesized in a stereoselective manner from 1,3-diaryl-2-propynyl silyl ethers by a catalytic reaction using potassium tert-butoxide under very mild conditions after acid treatment.
Trimethylsilyl Trifluoromethanesulfonate- Accelerated Addition of Catalytically Generated Zinc Acetylides to Aldehydes
作者:C. Wade Downey、Brian D. Mahoney、Vincent R. Lipari
DOI:10.1021/jo900102w
日期:2009.4.3
In the presence of TMSOTf, a wide variety of terminal acetylenes add rapidly and efficiently to aldehydes via a catalytically generated zinc acetylide. In the absence of TMSOTf, no reaction is observed under otherwise identical conditions.