Ethyl-4,4,4-trifluoroacetoacetate (ETFAA), a powerful building block for enantiopure chirons in trifluoromethyl-β-amino acid series
摘要:
Herein are studied new transformations of ethyl -4,4,4-trifluoroacetoacetate (ETFAA), giving access to a series of enantiopure chirons bearing both a trifluoromethyl group and an amino moiety. The key intermediate is obtained optically pure by a resolution procedure.(c) 2007 Elsevier B.V. All rights reserved.
Barbier Conditions for Reformatsky and Alkylation Reactions on Trifluoromethyl Aldimines
作者:Benoit Crousse、Mickael Dos Santos、Danièle Bonnet-Delpon
DOI:10.1055/s-2007-1000864
日期:2008.2
β-Trifluoromethyl β-amino acids and α-trifluoromethyl α-alkyl amines can be easily prepared under Barbier conditions from trifluoromethyl aldimines in moderate to good yields. β-Trifluoromethyl β-amino acids were obtained in good enantioselectivity from the chiral trifluoromethyl aldimine starting material.
A practical, highly enantioselective method for the synthesis of short-chain aliphatic beta-amino acidesters was developed starting from prochiral and easily accessible Substrates. This chemoenzymatic approach is based oil a nonenzymatic aza-Michael addition of benzylamine to enoates and subsequent lipase-catalyzed resolution via enantioselective aminolysis. The two reactions are carried out as a
Regioselectivity of the Conjugate Addition of Amines to Dissymmetrical Pull‐Pull Alkenes
作者:Alexander Yu. Rulev、Ilya N. Zubkov、Igor A. Ushakov、Valentin A. Semenov、Alexander V. Vashchenko、Jacques Maddaluno
DOI:10.1002/ejoc.202100325
日期:2021.6.14
The regioselectivity of the conjugate nucleophilic addition of amines to vicinal di-acceptor-substituted alkenes has been studied. The inverse local nucleophilicity indices give good account on the reactivity of the competitive electrophilic sites.