Enantioselective Aerobic Oxidation of α-Hydroxy-Ketones Catalyzed by Oxidovanadium(V) Methoxides Bearing Chiral, <i>N</i>-Salicylidene-<i>tert</i>-butylglycinates
作者:Chien-Tien Chen、Jun-Qi Kao、Santosh B. Salunke、Ya-Hui Lin
DOI:10.1021/ol1024053
日期:2011.1.7
Chiral oxidovanadium(V) methoxides prepared from 3,5-disubstituted-N-salicylidene-l-tert-butylglycines and vanadyl sulfate in air-saturated MeOH serve as highly enantioselective catalysts for asymmetric aerobic oxidations and kinetic resolution of alkyl, aryl, and heteroaryl α-hydroxy-ketones with differed α-substituents at ambient temperature in toluene or TBME (tert-butyl methyl ether). The best
Metallophosphites as Umpolung Catalysts: The Enantioselective Cross Silyl Benzoin Reaction
作者:Xin Linghu、Justin R. Potnick、Jeffrey S. Johnson
DOI:10.1021/ja0496468
日期:2004.3.1
metallophosphites as catalysts. As a result, nonenzymatic asymmetric cross silyl benzoin reactions have been achieved, giving optically active silyl ether-protected benzoin adducts. The reaction is general with respect to aryl, alkyl, and heterocyclic substrates with good to excellent yields and good to excellent enantioselectivities.