Catalysis by ionic liquid: a simple, green and efficient procedure for the Michael addition of thiols and thiophosphate to conjugated alkenes in ionic liquid, [pmIm]Br
摘要:
A room temperature ionic liquid, 1-pentyl-3-methylimidazolium bromide, [pmIm]Br efficiently catalyzes Michael addition of thiols and diethyl dithiophosphate to a variety of conjugated alkenes such as alpha,beta-unsaturated carbonyl compounds, carboxylic esters, nitriles and chalcones without requiring any other organic solvent and catalyst. The ionic liquid can be recycled for subsequent reactions without any appreciable loss of efficiency. (C) 2004 Elsevier Ltd. All rights reserved.
Efficient Synthesis of Thiopyrans Using a Sulfur-Enabled Anionic Cascade
作者:Fang Li、David Calabrese、Matthew Brichacek、Ivy Lin、Jon T. Njardarson
DOI:10.1002/anie.201108261
日期:2012.2.20
The fifth element: An efficient new synthetic method for accessing 3,6‐dihydro‐2H‐thiopyrans 1 in one pot has been developed. This method employs an anioniccascade, which is triggered by the addition of a vinyl nucleophile to a carbonyl group followed by S to O thiophosphate migration and an intramolecular thiolate displacement. The scope is demonstrated for a range of ketone and ester substrates
第五要素:开发了一种有效的新型合成方法,可在一锅中获得3,6-dihydro-2 H - thiopyrans 1。该方法采用阴离子级联,其通过将乙烯基亲核试剂加到羰基上,然后硫代磷酸酯从S到O的迁移和分子内硫醇盐的置换来触发。该范围适用于各种酮和酯底物。
A Convenient Synthesis of 2,4-Diarylthietanes by Reductive Cyclization of<i>O,O</i>-Diethyl<i>S</i>-(1,3-Diaryl-3-oxopropyl) Phosphorodithioates