Enantioselective α-Amination of Branched Aldehydes Promoted by Simple Chiral Primary Amino Acids
作者:Ji-Ya Fu、Qing-Chuan Yang、Qi-Lin Wang、Jun-Nan Ming、Fei-Ying Wang、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1021/jo102361h
日期:2011.6.3
A series of simple chiral primary amino acids were first successfully applied to promote the enantioselectiveα-amination of branchedaldehydes with azadicarboxylates and the desired adducts bearing quaternary stereogenic centers were obtained in excellent yields (up to 99%) and enantioselectivities (up to 97% ee).
Chiral α-Arylethanamines: An Organocatalyst for the Enantioselective α-Amination of Branched Aldehydes
作者:Ji-Ya Fu、Qi-Lin Wang、Lin Peng、Yong-Yuan Gui、Fan Wang、Fang Tian、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1002/ejoc.201201701
日期:2013.5
α-Arylethanamines were investigated as organocatalysts for the α-amination of branchedaldehydes with azodicarboxylates. Optimization identified (R)-1-(1-naphthyl)ethanamine (1g) as an effective and enantioselectiveorganocatalyst; multifunctional chiral quaternary amino aldehydes were successfully obtained in excellent yields (up to 99 %) and with excellent enantioselectivities (up to 98 % ee).
Enantioselective Synthesis of Planar‐Chiral Macrocycles through Asymmetric Electrophilic Aromatic Amination
作者:Donglei Wang、Ying‐Bo Shao、Yunrong Chen、Xiao‐Song Xue、Xiaoyu Yang
DOI:10.1002/anie.202201064
日期:2022.5.23
An efficient method for asymmetric synthesis of planar-chiral macrocycles has been developed through enantioselective electrophilic aromatic aminations with azodicarboxylates enabled by chiral phosphoric acid catalysis. A wide array of planar-chiral macrocycles bearing ansa chains with varied length (12-member to 19-member) and various functional groups were generated using this method with high to
The first enantioselective and diastereoselective synthesis of atropisomeric hydrazides was performed using one-pot sequential catalysis based on the enamine amination of branched aldehydes followed by phase-transfer N-alkylation. Chiral hydrazides were obtained with high yields and stereocontrol using commercially available reagents and catalysts. The permutation of catalysts allowed for a stereodivergent
Organocatalytic alpha-amination of alpha,alpha-disubstituted aldehydes promoted by 9-amino-(9-deoxy)-epi-quinine is described. alpha-Hydrazino aldehydes bearing a quaternary stereogenic center are obtained in good to excellent yields and enantioselectivities. (C) 2011 Elsevier Ltd. All rights reserved.