Investigations Concerning the Syntheses of TADDOL-Derived Secondary Amines and Their Use To Access Novel Chiral Organocatalysts
作者:Mario Waser、Katharina Gratzer
DOI:10.1055/s-0032-1316804
日期:——
of the catalysts prepared was found to be highly useful for the phase-transfer catalyzed α-alkylation of glycineSchiffbase (high yields and up to 93% ee). A structurally carefully diversified library of novel TADDOL-derived chiral secondary amines was synthesized and investigated for their applicability to obtain new organocatalysts like chiral Lewis bases and chiralphase-transfercatalysts. The scope
Asymmetric PTC Alkylation of Glycine Imines: Variation of the Imine Ester Moiety
作者:Barry Lygo、Bryan Allbutt
DOI:10.1055/s-2003-43368
日期:——
Studies into the enantioselective phase-transferalkylation of a series of glycine imine esters are presented. Using a quaternary ammonium salt catalyst derived from α-methylnaphthylamine, high enantioselectivities were obtained in reactions involving imines containing tert-butyl, benzhydryl, and benzyl esters. In contrast, a quaternary ammonium salt catalyst derived from dihydrocinchonidine gave highest