Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Toshiaki Morimoto"'
Publikováno v:
Chemical and Pharmaceutical Bulletin. 52:1445-1450
Axially chiral biphenyldiphosphine ligands bearing diphenylphosphino group(s) and/or dicyclohexylphosphino group(s) were prepared in enantiomerically pure form starting from 2,6-dimethylnitrobenzene via 8 steps: iodination, reduction, methoxylation t
Publikováno v:
Tetrahedron: Asymmetry. 6:23-26
Remarkable effects of the substituted diphenylphosphino groups of modified DIOPs on the enantioselectivity were observed in the asymmetric hydrogenation of α-phenyl-substituted enamides using their rhodium(I) complexes as catalysts. MOD-DIOP bearing
Publikováno v:
Tetrahedron: Asymmetry. 6:75-78
A new chiral bisphosphine ligand (6) bearing a cyclobutane framework was readily prepared by using diastereoselective [2+2] cycloaddition. Its rhodium(I) complex was found to be an efficient catalyst for the asymmetric hydrogenation of a cyclic enami
Publikováno v:
Chemical and Pharmaceutical Bulletin. 42:481-488
Chiral pyrrolidinebisphosphine ligands, (2S-cis)-BCPM and (2S-cis)-BCPP, bearing two different types of phosphino groups, a dicyclohexylphosphino group and a diphenylphosphino groups, were designed and prepared on the basis of our design concept for
Publikováno v:
Tetrahedron. 49:1793-1806
Optically pure (R)-arylmethylsuccinic acid mono-methyl esters were obtained efficiently by using the catalytic asymmetric hydrogenation of arylidenesuccinic acid monoesters with a rhodium(I) complex of a chiral bisphosphine, (4S,5S)-MOD-DIOP. Asymmet
Publikováno v:
Chemical and Pharmaceutical Bulletin. 41:1149-1156
Modified DIOPs, (4R, 5R)-4-(diaryl- or dialkylphosphino)methyl-5-(diarylphosphino)methyl-2, 2-dimethyl-1, 3-dioxolanes, were prepared on the basis of our design concept, and used as ligands for the rhodium(I)-catalyzed asymmetric hydrogenations of ke
Publikováno v:
ChemInform. 23
Autor:
Kiyoshi Yoshikawa, Katsuya Awano, Kazuo Achiwa, Toshiaki Morimoto, Naoko Yamamoto, Masanao Murata
Publikováno v:
Tetrahedron: Asymmetry. 3:13-16
A new atropisomeric biphenylbisphosphine, MOC-BIMOP, has been prepared in enantiomerically pure form and its rhodium(I) complex proved to be an efficient catalyst in the asymmetric hydrogenations of α-aminoketone hydrochloride and itaconic acid. A p
Publikováno v:
Tetrahedron: Asymmetry. 2:597-600
The chiral positioning array (P/M-chirality) of four phenyl rings in the rhodium-chiral bisphosphine catalyst has been revealed to play an important role in determining the absolute configuration of the asymmetric hydrogenation product.
Publikováno v:
Tetrahedron Letters. 31:261-264
An efficient total synthesis of (−)-deoxypodophyllotoxin has been achieved by employing the asymmetric hydrogenation of α-piperonylidenesuccinic acid half ester with a rhodium(I) complex of (S,S)-MOD-DIOP as a key step.