Asymmetric Full Saturation of Vinylarenes with Cooperative Homogeneous and Heterogeneous Rhodium Catalysis
作者:Haibo Wu、Jianping Yang、Bram B. C. Peters、Luca Massaro、Jia Zheng、Pher G. Andersson
DOI:10.1021/jacs.1c09975
日期:2021.12.8
enabled by a ligand accelerated effect, accounted for the facial selectivity in the consecutive arene hydrogenation. Tuning the ratio between the phosphineligand and the rhodium precursor controlled the formation of homogeneous and heterogeneous catalytic species that operate without interference from each other. The system is flexible in terms of both the chiral ligand and the nature of the external olefin
Hach; Protiva, Collection of Czechoslovak Chemical Communications, 1958, vol. 23, p. 1902,1907
作者:Hach、Protiva
DOI:——
日期:——
Functional-Group-Directed Diastereoselective Hydrogenation of Aromatic Compounds. 1
作者:Vidyadhar S. Ranade、Giambattista Consiglio、Roel Prins
DOI:10.1021/jo991091p
日期:1999.11.1
Diastereoselective liquid phase hydrogenation of a series of monosubstituted indane and tetralin substrates was studied on supported rhodium catalysts. Predominantly the cis-cis diastereomer, obtained by hydrogenation from the diastereoface opposite the substituent (at the stereogenic center), and the cis-trans diastereomer, obtained by hydrogenation from the diastereoface on the same side as the substituent, were formed. The diastereoselectivity between the two isomers was dependent on the steric repulsion or the electronic attraction of the substituent with the surface of the catalyst. The hydroxyl group did not exhibit a strong attraction (haptophilicity), and the cis-cis diastereomer was obtained as the major product. The amino group exhibited a very high haptophilicity, yielding primarily the cis-trans diastereomer. The diastereoselectivity obtained in the hydrogenation of all the substrates was influenced on addition of bases to the reaction mixture. In the case of alcoholic substrates, the selectivity to the cis-trans diastereomer could be substantially increased with alkaline hydroxide additives.