共查询到20条相似文献,搜索用时 15 毫秒
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α-氨基腈不仅可以很容易地转化为α-氨基酸,而且是合成许多具有生物活性的天然产物和药物的重要中间体.醛亚胺的不对称Strecker反应作为制备光学活性α-氨基腈的直接而有效的方法之一,已被广泛接受.作者介绍了醛亚胺的不对称Strecker反应研究进展. 相似文献
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Glueck DS 《Chemistry (Weinheim an der Bergstrasse, Germany)》2008,14(24):7108-7117
Chiral phosphanes, important ligands for metal-catalyzed asymmetric syntheses, are often prepared with compounds from the chiral pool, by using stoichiometric chiral auxiliaries, or by resolution. In some cases, this class of valuable compounds can be prepared more efficiently by catalytic asymmetric synthesis. This Concepts article presents an overview of these synthetic methods, including recent advances in catalysis by metal complexes, biocatalysis, organocatalysis, and ligand-accelerated catalysis. 相似文献
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Direct catalytic asymmetric enolexo aldolizations 总被引:2,自引:0,他引:2
Pidathala C Hoang L Vignola N List B 《Angewandte Chemie (International ed. in English)》2003,42(24):2785-2788
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The chiral nitrogen Lewis base, tricyclic cinchona alkaloid derivative TQO, is an effective promoter in the catalytic, asymmetric aza‐Baylis–Hillman reaction of N‐sulfonated imines Ar? CH?NR′ 1 (R′ = Ts, Ms, Ns, SES) with various activated olefins such as methyl vinyl ketone (MVK), ethyl vinyl ketone (EVK), acrolein, methyl acrylate, phenyl acrylate, or α‐naphthyl acrylate to give the corresponding adducts in moderate to good yields with good to high ee (up to 99 %) at ?30 °C or 45 °C in various solvents, including DMF/MeCN (1:1, v/v). The first such reaction of 1 with the simplest Michael acceptor MVK and methyl acrylate has been achieved with excellent enantioselectivity. The adducts derived from MVK and EVK had the opposite absolute configuration to those from acrolein, methyl acrylate, phenyl acrylate, and α‐naphthyl acrylate. A plausible mechanism has been proposed on the basis of previous reports and the authors’ investigations. An effective bifunctional chiral nitrogen Lewis base–Brønsted acid system has been revealed in this type of aza‐Baylis–Hillman reaction. 相似文献
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New developments in the asymmetric Stetter reaction 总被引:1,自引:0,他引:1
Christmann M 《Angewandte Chemie (International ed. in English)》2005,44(18):2632-2634
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Muncipinto G Moquist PN Schreiber SL Schaus SE 《Angewandte Chemie (International ed. in English)》2011,50(35):8172-8175
Multicomponent Petasis reactions: The first diastereoselective Petasis reaction catalyzed by chiral biphenols that enables the synthesis of syn and anti?β-amino alcohols in pure form has been developed. The reaction exploits a multicomponent approach that involves boronates, α-hydroxy aldehydes, and amines. 相似文献