A Simple, Efficient, and Green Procedure for the 1,4-Addition of Thiols to Conjugated Alkenes and Alkynes Catalyzed by Sodium Acetate in Aqueous Medium
作者:Brindaban C. Ranu、Tanmay Mandal
DOI:10.1071/ch06455
日期:——
A benign and inexpensive salt, sodium acetate, efficiently catalyzes 1,4-addition of thiols to a variety of conjugated alkenes such as α,β-unsaturatedketones, aldehydes, carboxylic esters, nitriles, nitro compounds, and chalcones in aqueous THF. The reactions are clean, fast, and high yielding.
Ionic liquid as catalyst and solvent: the remarkable effect of a basic ionic liquid, [bmIm]OH on Michael addition and alkylation of active methylene compounds
作者:Brindaban C. Ranu、Subhash Banerjee、Ranjan Jana
DOI:10.1016/j.tet.2006.10.077
日期:2007.1
ketones, carboxylic esters and nitriles. It further catalyzes the addition of thiols to α,β-acetylenic ketones and alkylation of 1,3-dicarbonyl and -dicyano compounds. The Michael addition to α,β-unsaturated ketones proceeds in the usual way, giving the monoaddition products, whereas addition to α,β-unsaturated esters and nitriles leads exclusively to the bis-addition products. The α,β-acetylenic ketones
Preparation of 1,3-Dithiolan-2-ylium Tetrafluoroborate and Its Reaction with Enol Trimethylsilyl Ethers
作者:V. Prakash Reddy、Donald R. Bellew、G. K. Surya Prakash
DOI:10.1055/s-1992-26336
日期:——
1,3-Dithiolan-2-ylium tetrafluoroborate (2) has been prepared and is found to be a good C-alkylating agent for the ß-1,3-dithiolaniation of carbonyl compounds through their enol trimethylsilyl ethers.
Electrochemical‐Induced Hydrogenation of Electron‐Deficient Internal Olefins and Alkynes with CH
<sub>3</sub>
OH as Hydrogen Donor
作者:Hongyun Qin、Jianjing Yang、Kelu Yan、Yaxuan Xue、Meichen Zhang、Xuejun Sun、Jiangwei Wen、Hua Wang
DOI:10.1002/adsc.202100022
日期:2021.4.13
Efficient hydrogenation of electron‐deficient internal olefins and alkynes access to saturate ketone with CH3OH as a single hydrogen donor under electrochemical conditions has been successfully developed. This hydrogenation strategy can be used to convert electron‐deficient internal olefins and alkynes to saturate ketone under electrochemical conditions with exogenous‐reductant and a metal catalyst