Chemoselective (Trans)thioacetalization of Carbonyl Compounds with a Reusable Lewis Acid-Surfactant-Combined Copper Bis(dodecyl sulfate) Catalyst in Water
A Lewis acid-surfactant-combined copper bis(dodecyl sulfate) [Cu(DS)2] catalyst served as an efficient and reusable catalyst for the thioacetalization and transthioacetalization of carbonyl compounds and O,O-acetals in water at room temperature. Some of the major advantages of this procedure are high chemoselectivity, ease of operation and purification without any organic solvent, and high yields.
Visible-light promoted dithioacetalization of aldehydes with thiols under aerobic and photocatalyst-free conditions
作者:Zhimin Xing、Mingyang Yang、Haiyu Sun、Zemin Wang、Peng Chen、Lin Liu、Xiaolei Wang、Xingang Xie、Xuegong She
DOI:10.1039/c8gc02237b
日期:——
A novel photocatalyst-free visible-light-mediated dithioacetalization of aldehydes and thiols has been developed.
一种新型的无光催化剂可见光介导的醛和硫醇的二硫缩合反应已经被开发。
Catalytic Asymmetric Oxidation of Cyclic Dithioacetals: Highly Diastereo- and Enantioselective Synthesis of the <i>S</i>-Oxides by a Chiral Aluminum(salalen) Complex
The reaction of nonsubstituted 1,3-dithiane also proceeded in a highlyenantioselective manner to give the monoxide with a small formation of the trans-1,3-dioxide, an overoxidation product. Five-membered 1,3-dithiolanes and seven-membered 1,3-dithiepanes also underwent oxidation to give monoxides with high diastereo- and enantioselectivity. It was found that the equilibrium between the two chairlike
Catalytic carbon–sulfur bond formation by amphoteric vanadyl triflate: exploring with thia-Michael addition, thioacetalization, and transthioacetalization reactions
作者:Chien-Tien Chen、Yow-Dzer Lin、Cheng-Yuan Liu
DOI:10.1016/j.tet.2009.10.012
日期:2009.12
A series of thiols have been examined as protic nucleophiles for Michael-type additions to alpha,beta-unsaturated carbonyls as well as double nucleophilic condensations with aldehydes, ketones, and acetals catalyzed by amphoteric, water-tolerant vanadyl triflate under mild and neutral conditions. The newly developed C-S bond formation protocols were carried out smoothly in good to high yields in a highly chemoselective manner. (C) 2009 Elsevier Ltd. All rights reserved.
Propargylic Dithioacetal as an Allene 1,3-Dication Synthon. Nickel-Catalyzed Cross-Coupling Reactions of Propargylic Dithioacetals with Grignard Reagents