Notes- Syntheses of Some 1-Alkylamino-1,1-di(hydroxymethyl)-2-phenylethanes
作者:B Shetty、Allan Day
DOI:10.1021/jo01081a619
日期:1960.11
Towards a universal organocatalyst for the synthesis of enantioenriched phenylalanine derivatives by enantioselective decarboxylative protonation
作者:Morgane Pigeaux、Romain Laporte、David C. Harrowven、Jérôme Baudoux、Jacques Rouden
DOI:10.1016/j.tetlet.2016.09.001
日期:2016.10
Access to enantioenriched non-proteogenic phenylalanine derivatives is described using the enantioselectivedecarboxylative protonation reaction of amidohemimalonate esters catalysed by various cinchona-based compounds. This study compares the catalytic efficiency as well as the enantioselectivity induced by three types of common organocatalysts, namely thioureas, squaramides and bis-cinchona squaramides
Highly Enantioselective Decarboxylative Protonation of α-Aminomalonates Mediated by Thiourea <i>Cinchona</i> Alkaloid Derivatives: Access to Both Enantiomers of Cyclic and Acyclic α-Aminoacids
Thiourea derived cinchona alkaloids promote the asymmetric decarboxylative protonation of cyclic, acyclic, or bicyclic alpha-aminomalonate hemiesters under mild and metal-free conditions to afford enantioenriched aminoesters in high yields and enantioselectivities up to 93%. Both enantiomers of the aminoesters have been synthesized with the same selectivity when using organic base 3 and its pseudoenantiomer