Asymmetrichydrogenation of maleic and fumaric acid derivatives with iridium catalysts based on N,P ligands provides an efficient route to chiral enantioenriched succinates. A new catalyst derived from a 2,6‐difluorophenyl‐substituted pyridine‐phosphinite ligand was developed and enables the conversion of a wide range of 2‐alkyl and 2‐arylmaleic acid diesters into the corresponding succinates in high
Asymmetric hydrogenation of various 3-substituted maleic anhydrides catalyzed by Rh/bisphosphine-thiourea (ZhaoPhos) under mild conditions was successfully developed. A wide range of 3-alkyl and 3-aryl maleic anhydrides was hydrogenated well to...
Catalytic asymmetric hydrogenation of dimethyl itaconate with trans-chelating chiral diphosphine ligands TRAP-rhodium complexes
作者:Ryoichi Kuwano、Masaya Sawamura、Yoshihiko Ito
DOI:10.1016/0957-4166(95)00330-r
日期:1995.10
Asymmetric hydrogenation of dimethyl itaconate catalyzed by the transchelating chiral diphosphine (R,R)-(S,S)-EtTRAP-rhodium complex gave (S)-dimethyl 2-methylsuccinate with 96% ee. Dimethyl 2-isopropylidenesuccinate, a tetrasubstituted olefin substrate, was also hydrogenated with (R,R)-(S,S)-BuTRAP-rhodium complex in high enantioselectivity (78% ee), but with opposite enantioselection.
FADEL, ANTOINE;SALAUN, JACQUES, TETRAHEDRON LETT., 29,(1988) N 48, C. 6257-6260
作者:FADEL, ANTOINE、SALAUN, JACQUES
DOI:——
日期:——
SYNTHESIS OF OPTICALLY ACTIVE LACTONES FROM L-ASPARTIC ACID AND INTERMEDIATES THEREOF