An Expeditious Entry to Benzylic and Allylic Sulfones through Byproduct-Catalyzed Reaction of Alcohols with Sulfinyl Chlorides
摘要:
In the absence of external catalysts and additives, a broad range of benzylic and allylic alcohols react with various sulfinyl chlorides to afford structurally diversified benzylic and allylic sulfones in moderate to excellent yields, and importantly, a catalysis with byproduct HCl is involved in this new protocol for sulfone synthesis.
非消旋连接的氢化铜可用于串联S N 2'/ 1,2-还原外消旋的森田-贝利斯-希尔曼(MBH)乙酸酯,以得到具有定义的烯烃几何形状的对映体富集的手性烯丙基醇。MBH酯(包括具有β取代基的酯)可以利用庞大的,低聚的,原位生成的三烷氧基硅氧烷离去基团转化为立体定义的烯酸酯。最后,公开了容易到达的MBH醇衍生物向非外消旋烯丙基醇的非典型转化。
Morita-Baylis-Hillman Reaction on Water without Organic Solvent, Assisted by a ‘Catalytic’ Amount of Amphiphilic Imidazole Derivatives
作者:Seijiro Matsubara、Keisuke Asano
DOI:10.1055/s-0029-1216944
日期:2009.10
A Morita-Baylis-Hillman (MBH) reaction using water as a solvent without any organic solvent can be performed by using an amphiphilic N-alkylimidazole. This reaction is accelerated by the addition of water and is the first example of a ‘catalytic’ MBH reaction without organic solvent in the presence of water.
<i>N</i>-Alkylimidazole
as Amphiphilic Organocatalyst: ‘Catalytic’ Morita-Baylis-Hillman
Reaction on Water without Organic Solvent
作者:Seijiro Matsubara、Keisuke Asano
DOI:10.1055/s-0028-1087484
日期:——
In the presence of water, a Morita-Baylis-Hillman reaction between methyl vinyl ketone and various aldehydes was performed with a catalytic amount of an imidazole carrying a hydrophobic group.
1-Methylimidazole 3-N-oxide as a new promoter for the Morita–Baylis–Hillman reaction
作者:Yu-Sheng Lin、Chih-Wei Liu、Thomas Y.R. Tsai
DOI:10.1016/j.tetlet.2005.01.099
日期:2005.3
The Morita-Baylis-Hillman reaction of aldehydes with alpha,beta-unsaturated ketones can be affected by the Lewis bases. We have found that 1-methylimidazole 3-N-oxide promoted the Morita-Baylis-Hiliman reaction of various activated aldehyde compounds in non-solvent system. This is a mild reaction condition and requires no special equipment to give the Morita-BaylisHillman adducts. (C) 2005 Elsevier Ltd. All rights reserved.
A highly active ionic liquid catalyst for Morita–Baylis–Hillman reaction
The Morita-Baylis-Hillman reaction is an efficient carbon-carbon bond forming reaction for the preparation of alpha-methylene-beta-hydroxycarbonyl compounds. A new and highly active di-naphthalene imidazolium salt has been synthesized. We have found that 1, 3-bis[2-(naphthalene-2-yloxy)propyl]imidazolium bromid promoted the Morita-Baylis-Hillman reaction of various aryl aldehyde compounds in the absence of solvents. Our studies show that the Morita-Baylis-Hillman reaction by the influence of ionic liquid to give a high yield and short reaction time. (c) 2005 Elsevier Ltd. All rights reserved.
An Expeditious Entry to Benzylic and Allylic Sulfones through Byproduct-Catalyzed Reaction of Alcohols with Sulfinyl Chlorides
In the absence of external catalysts and additives, a broad range of benzylic and allylic alcohols react with various sulfinyl chlorides to afford structurally diversified benzylic and allylic sulfones in moderate to excellent yields, and importantly, a catalysis with byproduct HCl is involved in this new protocol for sulfone synthesis.