This paper discusses the reactivity of various 2-substituted aziridine derivatives. The reaction of chiral 2-aryl-substituted aziridines with triethylamine trihydrofluoride (Et3N.3HF) afforded chiral beta-fluoroamines with high stereoselectivity. In contrast, the reaction of chiral 2-aliphatic-substituted aziridines with benzyl bromide, followed by treatment with Et3N.3HF, gave chiral beta-fluoroamines with high stereoselectivity.
Switching Regioselectivity in the Allylation of Imines by N-Side Chain Tuning
摘要:
A spectacular inversion of alpha- to gamma-regioselectivity in the allylzincation of imines can be achieved by fine-tuning of the N-side chain. This approach allows easy preparation of regioisomeric amines, in racemic as well as enantiopure forms. The usefulness of the method is illustrated by the parallel asymmetric syntheses of 2,3- and 2,5-diphenylpyrrolidines.
A Chiral Amine Transfer Approach to the Photocatalytic Asymmetric Synthesis of α-Trialkyl-α-tertiary Amines
作者:Georgia R. Harris、Aaron D. Trowbridge、Matthew J. Gaunt
DOI:10.1021/acs.orglett.2c04308
日期:2023.2.10
report the stereocontrolled addition of α-amino radicals reductively generated from imines via visible-light-mediated photoredox-catalysis to alkenes, giving rise to enantioenriched α-trialkyl-α-tertiary amines. This process exploits a commercially available phenylglycinol derivative as a source of both nitrogen and chiral information. DFT studies support a stereochemical model whereby an intramolecular