Thiourea catalysis of NCS in the synthesis of chlorohydrins
摘要:
Thiourea catalysis of reactions utilizing N-succinimides is demonstrated with NCS chlorination of olefins in the presence of water to afford chlorohydrins. (C) 2007 Published by Elsevier Ltd.
An efficient synthesis of (E)-α,β-unsaturated ketones and esters with total stereoselectivity by using chromium dichloride
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Méjica
DOI:10.1016/j.tet.2006.01.052
日期:2006.4
(E)-α,β-Unsaturatedketones 1 or esters 2 can be obtained with complete stereoselectivity by reaction of different 2-chloro-3-hydroxy ketones 3 or esters 4 and CrCl2. A comparative study of the results of synthesis of ketones 1 with CrCl2 or samarium is performed. A mechanism to explain both β-elimination reactions has been proposed.
Metal-free and selective cleavage of unstrained carbon–carbon single bonds: Synthesis of <font>β</font>-ketosulfones from <font>β</font>-chlorohydrins and sodium sulfinates
作者:Yanni Li、Deqiang Liang、Yu Chang、Xiangguang Li、Shaoguang Fu、Yunli Yuan、Baoling Wang
DOI:10.1080/00397911.2017.1362439
日期:2017.11.17
selective cleavage of unstrained C–C single bonds was developed. Under the catalysis of KI and in the presence of NaHCO3, the readily available α-chloro-β-hydroxy ketones underwent bond breaking and sulfonylation smoothly to afford β-ketosulfones with high efficiency and broad substrate scope. Mechanism investigations, both experimental and theoretical, showed that a retro-aldol cleavage/nucleophilic
benign method is advantageous from a green chemical viewpoint with regard to yield, substrates variation, reagent availability, and simple procedures. This method was applied to a short step formal synthesis of (R)-muscone, a natural macrocyclic musk.