Oxidative Generation of Thioalkyl Cations from 2-Tributylstannyl-1,3-dithianes and 1-(Tributylstannyl)alkyl Sulfides and Their Reactions with Olefinic Nucleophiles
作者:Koichi Narasaka、Noriyoshi Arai、Tatsuo Okauchi
DOI:10.1246/bcsj.66.2995
日期:1993.10
2-Tributylstannyl-1,3-dithianes and 1-(tributylstannyl)alkyl sulfides are oxidized with ammoniumhexanitratocerate(IV) or ferrocenium hexafluorophosphate to generate their cation radicals, which dissociate into the carbocations and tributylstannyl radical. The carbocations thus generated react with olefinic nucleophiles to afford the corresponding addition products in good yield.
Generation of Cation Radicals from 2-Tributylstannyl-1,3-dithianes and Their Reaction with Olefins
作者:Koichi Narasaka、Tatsuo Okauchi、Noriyoshi Arai
DOI:10.1246/cl.1992.1229
日期:1992.7
Oxidation of 2-tributylstannyl-1,3-dithianes with metallic oxidants generates reactive species such as 1,3-dithian-2-yl radical and/or cation by eliminating the stannyl group. Those intermediates react with olefins to give the intermolecular addition products.
Synthesis of .beta.-keto 1,3-dithianes from acetylenic ketones
作者:Brindaban C. Ranu、Sanjay Bhar、Ratna Chakraborti
DOI:10.1021/jo00052a064
日期:1992.12
Preparation of Protected β-Keto Aldehydes from β-Keto Esters via Selective Reduction of Acyl(alkoxycarbonyl)ketene Dithioacetals
作者:Eun Bok Choi、In Kwon Youn、Chwang Siek Pak
DOI:10.1055/s-1988-27709
日期:——
The acyl(alkoxycarbonyl)ketene dithioacetals 2 prepared from the corresponding ß-keto esters 1 in almost quantitative yield are reduced selectively with magnesium in methanol and subsequently dealkoxycarbonylated to give protected ß-keto aldehydes 4 high yields.