The Cinchona Primary Amine-Catalyzed Asymmetric Epoxidation and Hydroperoxidation of α,β-Unsaturated Carbonyl Compounds with Hydrogen Peroxide
作者:Olga Lifchits、Manuel Mahlau、Corinna M. Reisinger、Anna Lee、Christophe Farès、Iakov Polyak、Gopinadhanpillai Gopakumar、Walter Thiel、Benjamin List
DOI:10.1021/ja402058v
日期:2013.5.1
Using cinchona alkaloid-derived primary amines as catalysts and aqueous hydrogenperoxide as the oxidant, we have developed highly enantioselective Weitz-Scheffer-type epoxidation and hydroperoxidation reactions of α,β-unsaturated carbonylcompounds (up to 99.5:0.5 er). In this article, we present our full studies on this family of reactions, employing acyclic enones, 5-15-membered cyclic enones, and
Electroreductive ring-opening of .alpha.,.beta.-epoxy carbonyl compounds and their homologs through recyclable use of diphenyl diselenide or diphenyl ditelluride as a mediator
Ring opening reaction of epoxides with diphenyl phosphorazidate
作者:Masanori Mizuno、Takayuki Shioiri
DOI:10.1016/s0040-4039(99)01440-9
日期:1999.9
Diphenyl phosphorazidate with 4-dimethylaminopyridine and lithium perchlorate opens epoxides regio- and stereoselectively to give O-diphenylphosphoryl vicinal azidohydrins. For the alpha,beta-epoxy ketones and esters, only the corresponding alpha-azidovinyl ketones and esters were directly obtained, respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.
EISCH, JOHN J.;GALLE, JAMES E., J. ORGANOMET. CHEM., 341,(1988) N 1-3, 293-313