Rhodium-Catalyzed Asymmetric Arylation of Azomethine Imines
作者:Ryo Shintani、Ying-Teck Soh、Tamio Hayashi
DOI:10.1021/ol101700v
日期:2010.9.17
A rhodium-catalyzed addition of sodium tetraarylborates to azomethine imines has been described. Highly efficient asymmetric catalysis has also been achieved by employing a chiral diene ligand to give 1-(diarylmethyl)pyrazolidin-3-ones with high enantioselectivity.
[3 + 2]-Cycloadditions of Azomethine Imines and Ynolates
作者:Sarah E. Winterton、Joseph M. Ready
DOI:10.1021/acs.orglett.6b01104
日期:2016.6.3
A novel [3 + 2]-cycloaddition between azomethine imines and lithium ynolates is described to synthesize bicyclic pyrazolidinones. These bicyclic pyrazolidinones are versatile intermediates to form β-amino acids and monocyclic pyrazolidinones. High diastereoselectivity and stereospecificity allow access to optically active products.
Enantioselective Nucleophilic β-Carbon-Atom Amination of Enals: Carbene-Catalyzed Formal [3+2] Reactions
作者:Xingxing Wu、Bin Liu、Yuexia Zhang、Martin Jeret、Honglin Wang、Pengcheng Zheng、Song Yang、Bao-An Song、Yonggui Robin Chi
DOI:10.1002/anie.201606571
日期:2016.9.26
enantioselective β‐carbon amination for enals is disclosed. The nitrogen atom from a protected hydrazine with suitable electronic properties readily behaves as a nucleophile. Addition of the nitrogen nucleophile to a catalytically generated N‐heterocyclic‐carbene‐bound α,β‐unsaturated acyl azolium intermediate constructs a new carbon–nitrogen bond asymmetrically. The pyrazolidinone products from our catalytic