Brønsted Acid Catalyzed Asymmetric Aldol Reaction: A Complementary Approach to Enamine Catalysis
作者:Guillaume Pousse、Fabien Le Cavelier、Luke Humphreys、Jacques Rouden、Jérôme Blanchet
DOI:10.1021/ol101176j
日期:2010.8.20
A syn-enantioselective aldolreaction has been developed using Brønstedacidcatalysis based on H8-BINOL-derived phosphoric acids. This method affords an efficient synthesis of various β-hydroxy ketones, some of which could not be synthesized using enamine organocatalysis.
Synthetic utility of bowl-shaped tris(2,6-diphenyl-benzyl)silyl glyoxylate as a stable glyoxylate: application to highly diastereoselective aldol reactions
作者:Seiji Shirakawa、Keiji Maruoka
DOI:10.1016/s0040-4039(02)02557-1
日期:2003.1
A stable glyoxylate can be successfully applied to both syn- and anti-selective aldol reactions by using two different kinds of ordinary Lewis acids. Thus, treatment of bowl-shaped tris(2,6-diphenylbenzyl)silyl glyoxylate 1 with enol silyl ether under the influence of BF3.OEt2 gave syn-aldol product, while the use of TiCl4 afforded anti-aldol product with >97% selectivity. (C) 2002 Elsevier Science Ltd. All rights reserved.
Arbuzov,Yu.A.; Klimova,E.I., Journal of general chemistry of the USSR, 1962, vol. 32, # 11, p. 3606 - 3609
作者:Arbuzov,Yu.A.、Klimova,E.I.
DOI:——
日期:——
Enesulfonamides as Nucleophiles in Catalytic Asymmetric Reactions
prepared using Schiff's bases derived from aromatic aldehydes and amines or α-aminoesters. These complexes are versatile catalyst for the reaction between aliphatic aldehydes and various alkenes. The outcome of the reaction is controlled by the electronic nature of the alkene as the electron deficient alkenes undergo oxidative addition of aldehydes followed by dioxygen incorporation to yield 2-hydr