Rh-catalyzed asymmetric hydrogenation of α-aryl-β-alkylvinyl esters with chiral ferrocenylphosphine-phosphoramidite ligand
作者:Chao Dong、Dao-Sheng Liu、Lei Zhang、Xiang-Ping Hu
DOI:10.1016/j.tetlet.2020.152763
日期:2021.2
An enantioselective Rh-catalyzedhydrogenation of E/Z mixtures of trisubstituted vinyl esters has been disclosed. With a combination of [Rh(COD)2]BF4 and a structurally fine-tuning chiral ferrocenylphosphine-phosphoramidite ligand as the catalyst, a variety of E/Z mixtures of α-aryl-β-alkylvinyl esters have been successfully hydrogenated in high yields and with good to high enantioselectivities (up
Process for producing alpha-beta-unsaturated carbonyl compound
申请人:NIPPON ZEON CO., LTD.
公开号:EP0415745A2
公开(公告)日:1991-03-06
Disclosed is a process for producing an α,β-unsaturated carbonyl compound represented by the formula [II]:
wherein R₁, R₂, R₃ and R₄ each represents a hydrogen atom or a hydrocarbon residue and may be linear or may form a ring in optional combination thereof and total carbon atom number of R₁, R₂, R₃ and R₄ is 12 or less, which comprises contacting oxygen with an alkenyl compound represented by the formula [I]:
wherein R₁, R₂, R₃ and R₄ are as defined above and X represents a trihydrocarbylsilyl group or an acyl group in the presence of a platinum group metal-supporting catalyst.