bridge between asymmetric catalysis and enzymatic reactions by mechanistic investigations and the development of a catalytic and enantioselective approach to amination of alpha-keto esters by primary amines catalyzed by chiral Lewis acids as a model for transamination enzymes. Different Lewis acids can catalyze the half-transamination of alpha-keto esters using primary amine nitrogen sources such as pyridoxamine
A convenient synthesis of 4-unsubstituted .beta.-lactams
作者:Larry E. Overman、Tatsushi Osawa
DOI:10.1021/ja00292a040
日期:1985.3
A partir d'aminoacetonitriles et d'enolates d'esters ou d'α-aminoesters, synthese d'azetidinones-2
A partir d'aminoacetonitriles et d'enolates d'esters ou d'α-aminoesters, 合成 d'azetidinones-2
Intramolecular Wittig reactions with esters utilising triphenylphosphine and dimethyl acetylenedicarboxylate
作者:Lyndsay A. Evans、Kimberley E. Griffiths、Holger Guthmann、Patrick J. Murphy
DOI:10.1016/s0040-4039(01)02053-6
日期:2002.1
The intramolecular Wittig olefination of α-hydroxy- and α-amino esters has been effected in high yield using a combination of triphenylphosphine and dimethylacetylenedicarboxylate.
A newchemoselective procedure for the reductive transformation of organic azides to the corresponding N-(tert-butoxycarbonyl)amino derivatives using triethylsilane and di-tert-butyl dicarbonate in the presence of a catalytic amount of 20% Degussa is described.