Regiochemical control of the addition of aryl selenols and aryl thiols to the triple bond of arylpropiolates. Synthesis of seleno- and thioflavones and seleno- and thioaurones
Axially asymmetric ester compound and production method thereof
申请人:Tanaka Ken
公开号:US20090299076A1
公开(公告)日:2009-12-03
To provide an axially asymmetric optically active biaryl ester compound that can easily produced without the step of optical resolution which was almost indispensable in conventional methods. There is provided a method for producing an axially asymmetric ester compound, comprising a cycloaddition of a compound having a triple bond with the use of a catalyst containing rhodium metal and an optically active bisphosphine.
On the Synthesis of Arylpropiolic Acids and Investigations towards the Formation of Vinyl Chlorides by HCl Addition During Esterification Reactions
作者:Marko Hapke、Karolin Kral、Anke Spannenberg
DOI:10.1055/s-0030-1258399
日期:2011.2
The synthesis protocol for the preparation of different arylpropiolic acids using the Negishi reaction and the addition of HCl to the alkyne moiety of these acids in subsequent esterificationreactions using SOCl2 was examined. alkynes - esterification - additionreactions - vinyl chlorides - Negishi reaction
Axiallychiral hydroxy carboxylic acid derivatives were successfully synthesized with high yields and ee values by the cationic rhodium(I)/axiallychiral biaryl bisphosphine complex-catalyzed enantioselective [2 + 2 + 2] cycloaddition. Axiallychiral hydroxy and dihydroxy carboxylic acid derivatives, bearing the aryl group at the ortho-position of the alkoxycarbonyl group, were also synthesized with
Catalytic Atropenantioselective Heteroannulation between Isocyanoacetates and Alkynyl Ketones: Synthesis of Enantioenriched Axially Chiral 3-Arylpyrroles
作者:Sheng-Cai Zheng、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201812654
日期:2019.1.28
We report herein the first examples of catalytic enantioselective synthesis of axiallychiral 3‐arylpyrroles. Reaction of α‐isocyanoacetates with β‐aryl‐α,β‐alkynic ketones in the presence of silver oxide and a phosphine ligand derived from Cinchona alkaloid occurred chemoselectively to afford enantioenriched 3‐arylpyrroles in high yields with excellent enantiomeric excesses. The pyrrole ring was constructed