摘要 铟(III)路易斯酸与水和胺的相容性使其可用于协同催化和协同催化。铟盐的存在促进了其中生成碳正离子的立体选择性有机催化S N 1型反应。可以在有机催化中利用铟盐的特殊性质来设计与水相容的,良性的,绿色的工艺。这种铟(III)促进的有机催化方法的发展是我们最近研究的重点,本文对此进行了总结。 铟(III)路易斯酸与水和胺的相容性使其可用于协同催化和协同催化。铟盐的存在促进了其中生成碳正离子的立体选择性有机催化S N 1型反应。可以在有机催化中利用铟盐的特殊性质来设计与水相容的,良性的,绿色的工艺。这种铟(III)促进的有机催化方法的发展是我们最近研究的重点,本文对此进行了总结。
This invention aims at providing a catalyst for producing an optically active aldehyde or an optically active ketone, which is an optically active carbonyl compound, by carrying out selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, particularly a catalyst which is insoluble in a reaction mixture for obtaining optically active citronellal which is useful as a flavor or fragrance, by carrying out selective asymmetric hydrogenation of citral, geranial or neral; and a method for producing a corresponding optically active carbonyl compound. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table is supported on a support, an optically active cyclic nitrogen-containing compound and an acid.
A highly diastereoselective synthesis of chroman derivatives bearing spirocyclic N,O-acetals skeleton via a one-pot tandem reaction
作者:Yu Zhou、Kai-Da Zhou、Xiao-Ping Xu、Ya-Nan Zhu、Zhen Wu、Shun-Jun Ji
DOI:10.1016/j.tet.2014.10.073
日期:2014.12
A tandemreaction for the synthesis of chroman framework via a one-potreaction of phenol, paraformaldehyde, and 5-benzylimidazolidin-4-one mediated by p-nitrobenzoic acid is described. The chroman derivatives containing spirocyclic N,O-acetal skeleton can be obtained in moderate to good yields (up to 89%) with good to excellent diastereoselectivities (up to >20:1 dr).
Imidazolethiones: novel and efficient organocatalysts for asymmetric Friedel–Crafts alkylation
作者:Xianrui Liang、Jiaoyang Fan、Fei Shi、Weike Su
DOI:10.1016/j.tetlet.2010.02.160
日期:2010.5
Imidazolethiones organocatalyzed the asymmetric Friedel-Crafts alkylation of pyrroles with alpha,beta-unsaturated aldehydes was achieved to afford the corresponding adducts in moderate to good yields and good to excellent enantioselectivities. The possible mechanism was proposed. (C) 2010 Elsevier Ltd. All rights reserved.
US8217204B2
申请人:——
公开号:US8217204B2
公开(公告)日:2012-07-10
Aromatic Interactions in Organocatalyst Design: Augmenting Selectivity Reversal in Iminium Ion Activation
作者:Mareike C. Holland、Jan Benedikt Metternich、Constantin Daniliuc、W. Bernd Schweizer、Ryan Gilmour
DOI:10.1002/chem.201500270
日期:2015.7.6
that intermolecular aromatic (CH–π and cation–π) interactions between the incipient iminium cation and the indole ring system is key to rationalising selectivityreversal. This is absent in the N‐methylpyrrole alkylation, thus forming the basis of two competing enantio‐induction pathways. A simple L‐valine catalyst has been developed that significantly augments this interaction.