Synthesis of Chiral Esters via Asymmetric Wolff Rearrangement Reaction
作者:Jing Meng、Wei-Wei Ding、Zhi-Yong Han
DOI:10.1021/acs.orglett.9b03227
日期:2019.12.20
The first asymmetric Wolff rearrangement reaction that directly converts α-diazoketones into broadly useful chiral α,α-disubstituted carboxylic esters with high enantioselectivities (up to 97.5:2.5 er) is reported. The cascade reaction proceeds through the seamless combination of visible-light-induced formation of the ketene intermediate and asymmetric ketene esterification using a readily available
Synthesis of 2-aminofurans and 2-unsubstituted furans via carbenoid-mediated [3 + 2] cycloaddition
作者:Yaojia Jiang、Vanessa Zhong Yue Khong、Emmanuvel Lourdusamy、Cheol-Min Park
DOI:10.1039/c2cc18139h
日期:——
An efficient dual synthetic manifold for 2-aminofurans and 2-unsubstituted furans has been developed. The carbenoid-mediated [3 + 2] cycloaddition of copper carbenoids with enamines provides 2-amino-2,3-dihydrofurans which serve as common intermediates for both 2-aminofurans and 2-unsubstituted furans.
ketenes from acyl chlorides and amines may be incompatible with TM catalysis (i.e., reactive acyl chloride and amine hydrochloride byproducts). Herein, we detail the unprecedented asymmetric [4+2] cycloaddition of vinyl benzoxazinanones with a variety of ketene intermediates via sequential visible-light photoactivation and palladiumcatalysis. It is well demonstrated that the traceless and transient generation
Novel 1,3-dipolar cycloaddition of diazocarbonyl compounds to alkynes catalyzed by InCl3 in water
作者:Nan Jiang、Chao-Jun Li
DOI:10.1039/b311763d
日期:——
The first intermolecular 1,3-dipolar cycloaddition of diazocarbonylcompounds with alkynes was developed by using an InCl(3) catalyzed cycloaddition in water. The reaction was found to proceed by a domino 1,3-dipolar cycloaddition-hydrogen (alkyl or aryl) migration.