The stereochemistry of addition of lithiumenolates to the α,β-epoxyaldehydes 1z–3 has been investigated. Moderate to high diastereoselectivity (up to 13:1) is obtained in favour of the anti isomer, which is explained by the Felkin-Anh model for asymmetric induction.
The Lewis acid mediated aldol reaction of chiral alpha, beta-cis and trans epoxyaldehydes 1 and 2 with tert-butyl ketene silyl acetal proceeds mainly with anti diastereofacial preference. The best results were obtained for cis epoxyaldehyde 1 in the presence of catalytic amounts of BiCl3 . 1.5 eq. ZnI2 (anti:syn similar to 13:1), whereas the poorest stereoselectivity was observed when an excess of LiClO4 was used (anti:syn similar to 1:1) The more stable epoxyaldehyde conformers were determined and the diastereofacial preference was found to be in agreement with a nucleophilic attack on the energetically more favoured conformers.
Mukaiyama aldolisation reactions of α,β-epoxyaldehydes in aqueous media
作者:Yvan Ruland、Pierre Noereuil、Michel Baltas
DOI:10.1016/j.tet.2005.07.027
日期:2005.9
The Mukaiyama aldolisation reaction in aqueous media of cis and trans alpha,beta-epoxyaldehydes with tert-butyldimethylsilyl ketene acetal in the presence of Lewis's acids was studied. Sc(OTf)(3) gave the best results in terms of selectivity. The same reaction of cis and trans alpha., beta-epoxyaldehydes with the enoxysilane of ethyl pyruvate resulted in epoxy Substituted ulosonic derivatives issued from a double sequential condensation of the pyruvate on the epoxy derivatives. (c) 2005 Elsevier Ltd. All rights reserved.