Highly
<i>E</i>
‐Selective and Enantioselective Michael Addition to Electron‐Deficient Internal Alkynes Under Chiral Iminophosphorane Catalysis
作者:Daisuke Uraguchi、Kohei Yamada、Takashi Ooi
DOI:10.1002/anie.201503928
日期:2015.8.17
A highly E‐selective and enantioselective conjugate addition of 2‐benzyloxythiazol‐5(4H)‐ones to β‐substituted alkynyl N‐acyl pyrazoles is achieved under the catalysis of a P‐spiro chiral iminophosphorane. Simultaneous control of the newly generated central chirality and olefin geometry is possible with a wide array of the alkynyl Michael acceptors possessing different aromatic and aliphatic β‐substituents
Flexible synthesis, structural determination, and synthetic application of a new C<sub>1</sub>-symmetric chiral ammonium betaine
作者:Daisuke Uraguchi、Kyohei Koshimoto、Takashi Ooi
DOI:10.1039/b916627k
日期:——
A C1-symmetric chiral ammonium betaine has been developed, and its intramolecular ion-pairing structure in solid state and its catalytic performance to achieve the highly stereoselective Mannich-type reaction of 2-alkoxythiazol-5(4H)-ones are revealed.
Primary amine catalyzed diastereo- and enantioselective Michael reaction of thiazolones and α,β-unsaturated ketones
作者:Min Lu、Hong Li、Chuncheng Zou、Jianchang Li、Chengyu Liu、Maolin Sun、Yueyue Ma、Ruihua Cheng、Jinxing Ye
DOI:10.1039/c9ob02067e
日期:——
The chiral primary aminecatalyzed asymmetric Michael reaction of thiazolones and α,β-unsaturated ketones was reported. Two different optimal catalytic systems were obtained corresponding to cyclic and linear α,β-unsaturated ketones. By employing chiral primary amines as the catalysts and amino-acid derivatives as the additives, a variety of Michael adducts containing the scaffold of the thiazole ring