Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/198167
Type: Artigo de periódico
Title: 1,5-asymmetric Induction In Boron-mediated Aldol Reactions Of Beta-oxygenated Methyl Ketones.
Author: Dias, Luiz C
Aguilar, Andrea M
Abstract: This tutorial review describes that high levels of substrate-controlled, 1,5-stereoinduction are obtained in the boron-mediated aldol reactions of beta-oxygenated methyl ketones with achiral and chiral aldehydes. Remote induction from the boron enolates gives the 1,5-anti adducts, with the enolate pi-facial selectivity critically dependent upon the nature of the beta-alkoxy protecting group. This 1,5-anti aldol methodology has been strategically employed in the total synthesis of several natural products with remarkable pharmacological activities. At present, the origin of the high level of 1,5-anti induction obtained with the boron enolates is unclear, although a model based on hydrogen bonding between the beta-alkoxy oxygen and the formyl aldehyde hydrogen has recently been proposed.
Subject: Aldehydes
Biological Products
Boron
Hydrogen Bonding
Ketones
Stereoisomerism
Rights: aberto
Identifier DOI: 10.1039/b701081h
Address: http://www.ncbi.nlm.nih.gov/pubmed/18224256
Date Issue: 2008
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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