A General Organocatalytic System for Enantioselective Radical Conjugate Additions to Enals
作者:Emilien Le Saux、Dengke Ma、Pablo Bonilla、Catherine M. Holden、Danilo Lustosa、Paolo Melchiorre
DOI:10.1002/anie.202014876
日期:2021.3
enantioselective conjugate addition of carbon‐centered radicals to aliphatic and aromatic enals. The process uses an organic photoredox catalyst, which absorbs blue light to generate radicalsfrom stable precursors, in combination with a chiral amine catalyst, which secures a consistently high level of stereoselectivity. The generality of this catalytic platform is demonstrated by the stereoselective interception
Assembly of 4-Substituted 3-Nitro-1,2,3,4-tetrahydropyridines via Organocatalytic Michael Addition
作者:Lele Huo、Anqi Ma、Yihua Zhang、Dawei Ma
DOI:10.1002/adsc.201100903
日期:2012.4.16
An organocatalyticMichaeladdition of protected 2‐amino‐1‐nitroethanes to α,β‐unsaturated aldehydes followed by treatment with TFA afforded 4‐substituted 3‐nitro‐1,2,3,4‐tetrahydropyridines with good diastereoselectivity and excellent enantioselectivity. Good yields were observed in the case of β‐aryl‐substituted α,β‐unsaturated aldehydes as the substrates, while moderate yields were obtained when
One-Pot Preparation of Enantiopure Fluorinated β-Amino Acid Precursors
作者:Joshua H. Jones、Chandrakumar Appayee、Stacey E. Brenner-Moyer
DOI:10.1002/ejoc.201402369
日期:2014.8
Specifically, carbon–nitrogen and carbon–fluorine bond-forming reactions were combined in an organocascadereaction to produce β-amino-α,α-difluoro carbonyl compounds containing alkyl substituents at the β-position. As such, this method is mechanistically distinct from, and complementary to, existing one-pot catalytic enantioselective methods for the preparation of fluorinated β-amino acid precursors
Highly Regio- and Enantioselective γ-Alkylation of Linear α,β-Unsaturated Aldehydes
作者:Mahesh S. Kutwal、Chandrakumar Appayee
DOI:10.1002/ejoc.201700645
日期:2017.8.10
Abstract: Asymmetric alkylation is one of the most useful carbon-carbon bond forming reactions in synthetic organic chemistry. Chiral amine catalyzed alkylation reactions often lack regioselectivity due to multiple reactive centers. Particularly, alkylation of linear 2-enals through dienamine catalysis produces a mixture of regioisomers due to the reactive a- and b-positions. There are few attempts
摘要:不对称烷基化是合成有机化学中最有用的碳-碳键形成反应之一。由于多个反应中心,手性胺催化的烷基化反应通常缺乏区域选择性。特别是,线性 2-烯醛通过二烯胺催化的烷基化由于具有反应性的 a-位和 b-位而产生区域异构体的混合物。很少有人试图掩盖 a 反应中心以实现 g 选择性。还发现在远程 g 位控制对映选择性非常具有挑战性。我们使用三氟乙醇 (TFE) 作为共溶剂实现了线性 a,b-不饱和醛的高度区域选择性 g-烷基化。此外,我们已经证明了对 g-烷基化产物的对映体富集的原位动力学分辨率。
[EN] FRAGRANCE AND FLAVOR COMPOSITIONS CONTAINING ISOMERIC ALKADIENALS OR ISOMERIC ALKADIENENITRILES<br/>[FR] COMPOSITION AROMATISÉE OU PARFUMÉE CONTENANT DES ALCADIÉNALS ISOMÈRES OU DES ALCADIÈNENITRILES ISOMÈRES
申请人:BEDOUKIAN RES INC
公开号:WO2017100426A1
公开(公告)日:2017-06-15
A composition containing at least one isomeric alkadienal or at least one isomeric alkadienenitrile in an amount effective to impart a fragrance or flavor to the composition. A fragrance or flavor composition containing at least one isomeric alkadienal or at least one isomeric alkadienenitrile in an amount effective to impart a fragrance or flavor to the composition. A consumer product containing the fragrance or flavor composition having at least one isomeric alkadienal or at least one isomeric alkadienenitrile in an amount effective to impart a fragrance or flavor to the composition. A method of imparting a fragrance or flavor to a consumer product by adding to the consumer product a fragrance or flavor composition containing at least one isomeric alkadienal or at least one isomeric alkadienenitrile in an amount effective to impart a fragrance or flavor to the consumer product.