Indium(iii) catalysed substrate selective hydrothiolation of terminal alkynes
作者:Rupam Sarma、Nimmakuri Rajesh、Dipak Prajapati
DOI:10.1039/c2cc30350g
日期:——
In(OTf)3 is reported as the first catalyst having the ability to selectively catalyse both Markovnikov and anti-Markovnikov hydrothiolation of terminal alkynes under identical reaction conditions depending upon the nature of the thiol employed.
N-heterocyclic carbene-catalyzed regio- and stereoselective hydrothiolation reaction of alkynes
作者:Zi-Song Cong、Yang Zhang、Guang-Fen Du、Cheng-Zhi Gu、Lin He
DOI:10.1080/00397911.2018.1468910
日期:2018.7.18
Abstract N-heterocyclic carbenes (NHCs) have been utilized as Brønsted base to catalyze the hydrothiolation reaction between alkynes and thiols to produce the vinyl sulfides stereoselectively. Graphical Abstract Graphical Abstract
The highlyselective anti‐Markovnikov addition of thiols to unactivated alkenes and alkynes was demonstrated by using 3,4‐dimethyl‐5‐vinylthiazolium iodide or its polymer, poly(3,4‐dimethyl‐5‐vinylthiazolium) iodide, as a complementary catalyst. The reaction proceeded cleanly under base‐free conditions in air with both aromatic and aliphatic thiols. The polymer catalyst showed a high turnover number
Straightforward and highly efficient catalyst-free regioselective reaction of thiol to β-nitrostyrene: a concise synthesis of vinyl sulfide and nitro sulfide
作者:Cheng-Ming Chu、Zhijay Tu、Pohsi Wu、Chieh-Chieh Wang、Ju-Tsung Liu、Chun-Wei Kuo、Yu-Hsuan Shin、Ching-Fa Yao
DOI:10.1016/j.tet.2009.02.074
日期:2009.5
Under catalyst-free reaction conditions, solvent-mediated addition of thiol 2 to β-nitrostyrene 1 proceeded with regioselective control to afford either adduct 3 or vinylsulfide 4 in good to excellent yield. Thermodynamic and autocatalytic reaction mechanisms were proposed to rationalize the products thus formed.
A transition-metal-free protocol for the synthesis of non-terminal alkenylethers, alkenylsulfides, and N-vinylazoles fromarylaldehydes or diarylketones, DMSO and O, S, N-nucleophiles has been reported. In this protocol, 24 examples of non-terminal alkenylethers and 28 examples of non-terminal alkenylsulfides in 72–95% yields have been synthesized within 5 min. Moreover, 27 examples of non-terminal