Titanium-salan-catalyzed asymmetric sulfoxidations with H<sub>2</sub>O<sub>2</sub>: design of more versatile catalysts
作者:Evgenii P. Talsi、Konstantin P. Bryliakov
DOI:10.1002/aoc.2968
日期:2013.4
3’‐diphenyl substituents in the salicylidene rings of the salan ligand are efficient sulfoxidation catalysts, capable of catalyzing the asymmetric oxidation of bulky aryl benzyl sulfides with H2O2 with good to high enantioselectivities. In this paper, substituent effects on titanium‐salan‐catalyzed enantioselective oxidation of sulfides to sulfoxides have been systematically investigated. Titanium–salan
在salan配体的亚水杨基环中具有3,3'-二苯基取代基的钛-salan配合物是有效的硫氧化催化剂,能够以高至高对映选择性催化大分子芳基苄基硫化物与H 2 O 2的不对称氧化。在本文中,已经系统地研究了取代基对钛-铝催化的硫化物对映体选择性氧化成亚砜的影响。在5,5'-位(3,3'-H 2具有卤素取代基的钛-铝催化剂已经发现二氢取代的)具有良好至高对映选择性地催化庞大的芳基苄基硫化物和小的烷基苯基硫化物的氧化。动力学数据证明了硫化物对亲电子活性氧的直接攻击。提出了一致的反应机理。版权所有©2013 John Wiley&Sons,Ltd.