Mechanistic and stereochemical aspects of the Lewis acid mediated cleavage of α-aminoacetals
作者:Mark A Graham、Alan H Wadsworth、Mark Thornton-Pett、Benedetta Carrozzini、Giovanni L Cascarano、Christopher M Rayner
DOI:10.1016/s0040-4039(01)00292-1
日期:2001.4
The TMSOTf mediated nucleophilic cleavage of alpha -aminoacetals can be used to prepare a variety of substituted amines, with variable levels of stereocontrol depending on the substitution patterns. The reaction most likely proceeds via either an alpha -alkoxy aziridinium ion or an alpha -oxocarbenium ion depending on the type of nucleophile. (C) 2001 Elsevier Science Ltd. All rights reserved.
SUZUKI TAKAYOSHI; TAKAMOTO MASAYUKI; OKAMOTO TOSHIHIKO; TAKAYAMA HIROAKI, CHEM. AND PHARM. BULL., 34,(1986) N 5, 1888-1900
TAKAYAMA H.; TAKAMOTO M.; OKAMOTO T., TETRAHEDRON LETT. <TELE-AY>, 1978, NO 15, 1307-1308
作者:TAKAYAMA H.、 TAKAMOTO M.、 OKAMOTO T.
DOI:——
日期:——
Studies on the Lewis acid mediated cleavage of α-aminoacetals: synthesis of novel 1,2-aminoethers, and evidence for α-alkoxy aziridinium ion intermediatesElectronic supplementary information (ESI) available: correlation of 1H NMR spectra between the syn and anti diastereomeric series. See http://www.rsc.org/suppdata/ob/b2/b210116e/
作者:Mark A. Graham、Alan H. Wadsworth、Abdul Zahid、Christopher M. Rayner
DOI:10.1039/b210116e
日期:2003.2.27
reactive intermediates involved in the reaction. With diethylzinc, it is most likely that the reaction proceeds by coordination of the nucleophile to the amino group followed by transfer of an ethyl group to an alpha-oxocarbenium ion. With non-coordinating nucleophiles, the stereochemical outcome can be rationalised in terms of addition to the possible alpha-alkoxy aziridiniumionintermediates.