Copper-Catalyzed Iminoiodane-Mediated Aminolactonization of Olefins: Application to the Synthesis of 5,5-Disubstituted Butyrolactones
摘要:
A copper(I)-catalyzed reaction of a variety of 4-aryl-pent-4-enoates with nosyliminolodane generated in situ provides the corresponding 5-aryl-5. nosylamidomethylbutyrolactones. The reaction presumably proceeds via an aziridine intermediate, which could be isolated in one case.
The asymmetric alkylation of Schiff bases under basic conditions in a ball mill was performed. The starting Schiff bases of glycine were prepared beforehand by milling protected glycine hydrochloride and benzophenone imine, in the absence of solvent. The Schiff base was then reacted with a halogenated derivative in a ball mill in the presence of KOH. By adding a chiral ammonium salt derived from cinchonidine
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