作者:Ramin Dubey、Nathan W. Polaske、Gary S. Nichol、Bogdan Olenyuk
DOI:10.1016/j.tetlet.2009.05.031
日期:2009.7
Organocatalytic alpha-sulfenylation of substituted piperazine-2,5-diones is reported through the use of cinchona alkaloids as Lewis bases and electrophilic sulfur transfer reagents. 1-Phenylsulfanyl[1,2,4]triazole, a novel Sulfur transfer reagent, gave excellent product yields with a number of substituted piperazine-2,5-diones under mild conditions. Catalyst loading, stoichiometry Of Sulfur electrophile, temperature, and solvent were optimized to achieve high product yields. (C) 2009 Elsevier Ltd. All rights reserved.