208118-05-2Relevant academic research and scientific papers
Asymmetric 1,4-addition of alkenylzirconium reagents to α,β-unsaturated ketones catalyzed by chiral rhodium complexes
Oi, Shuichi,Sato, Takashi,Inoue, Yoshio
, p. 5051 - 5055 (2007/10/03)
Highly enantioselective 1,4-addition of alkenylzirconocene chlorides to α,β-enones was found to be catalyzed by a chiral rhodium complex generated from [Rh(cod)(MeCN)2]BF4 and (S)-BINAP. The reaction can be applied to either cyclic or acyclic enones and the optical yield was up to 99% ee. The reaction mechanism would involve the transmetalation between the alkenylzirconocene chloride and the rhodium complex to give the alkenylrhodium species as a key intermediate.
A chiral chelating diene as a new type of chiral ligand for transition metal catalysts: Its preparation and use for the rhodium-catalyzed asymmetric 1,4-addition
Hayashi, Tamio,Ueyama, Kazuhito,Tokunaga, Norihito,Yoshida, Kazuhiro
, p. 11508 - 11509 (2007/10/03)
As a new type of chiral ligand, a C2-symmetric norbornadiene derivative (1R,4R)-2,5-dibenzylbicyclo[2.2.1]hepta-2,5-diene (1) was prepared and used for the rhodium-catalyzed asymmetric addition of organoboron and -tin reagents to α,β-unsaturate
Rhodium-catalyzed asymmetric 1,4-addition of 2-alkenyl-1,3,2- benzodioxaboroles to α,β-unsaturated ketones
Takaya, Yoshiaki,Ogasawara, Masamichi,Hayashi, Tamio
, p. 8479 - 8482 (2007/10/03)
Reaction of 2-alkenyl-1,3,2-benzodioxaboroles, which are readily accessible by hydroboration of alkynes with catecholborane, with α,β- unsaturated ketones in the presence of rhodium/(S)-binap catalyst and triethylamine in dioxane/H2O (10/1) pro
