Palladium Catalyzed Reaction of Bis(triisopropylsilyl)disulfide with Acetylenes
作者:Yves Gareau、Arturo Orellana
DOI:10.1055/s-1997-5774
日期:1997.7
The cross-coupling reaction of Bis(triisopropylsilyl)-disulfide on acetylenes yielded 1,2-alkylthioolefins after deprotection with TBAF and quenched with an electrophile.
The cross-coupling reaction of bis-triisopropylsilyl disulfide 1 on alkynes yielded 1,2-bis-triisopropylsilanylsulfanyl-alkenes 2, a new chemical class. A series of tri and tetrasubstituted olefins 2 were prepared and their behavior toward electrophiles was studied. The triisopropylsilyl groups could be readily removed by treatment with TBAF at 0 degreesC for 1 h or cesium acetate at 70 degreesC for 2 h. Soft and hard electrophiles were submitted to 2 under these conditions. The electrophiles can either react to yield double addition products with alkyl and activated halides, epoxides and acyl chlorides or cyclic adducts with chloroformate derivatives. In the latter case, 1,3-dithiol-2-ones or 1,3-dithiol-2-thiones are prepared. (C) 2001 Elsevier Science Ltd. All rights reserved.
Preparation of 2,5,7-Trithiabicyclo[2.2.1]heptane from 1,2-Bis-triisopropylsilanylsulfanyl Alkenes
作者:Yves Gareau、Hélène Juteau、Nancy N. Tsou、Richard G. Ball
DOI:10.1021/ol0524858
日期:2006.1.1
[reaction: see text] The chemical behavior of 1,2-bis-triisopropylsilanylsulfanyl alkenes 1 is relatively unexplored, and the weak sulfur-silicon bonds give rise to various transformations. Under acidic conditions (HCl) and in the presence of a Lewis acid at room temperature the bicyclic adduct 2 is obtained in good yield. The structure was confirmed by X-ray crystal analysis with R = benzyl.