Zobrazeno 1 - 10
of 24
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:
Chemical and Pharmaceutical Bulletin. 43:927-934
A series of (β-N-sulfonylaminoalkyl)phosphine ligands has been developed and employed for asymmetric palladium-catalyzed hydrosilylation and Heck-type hydroarylation, affording up to 72% ee and 90% yield.
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:
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:
Chemical and Pharmaceutical Bulletin. 46:704-706
Novel chiral P,S-hybrid ligands bearing 1,2-cis phosphinomethyl (or thiomethyl) and thio (or phosphino) groups on a cyclopentane skeleton were prepared by using borane as a protecting group for the phosphino group. Asymmetric hydrosilylation of aceto
Publikováno v:
Chemical and Pharmaceutical Bulletin. 42:1951-1953
A neutral iridium(I) complex of (4R, 5R)-MOD-DIOP (1b) was found to be an efficient catalyst for the asymmetric hydrogenation of imines, N-(α-methylbenzylidene)benzylamine (4) and 2, 3, 3-trimethylindolenine (6), in the presence of tetrabutylammoniu
Publikováno v:
Chemical and Pharmaceutical Bulletin. 40:2894-2896
Remarkable effects of the substituted diphenylphosphino groups of modified DIOPs on the enantioselectivity and the catalytic activity were observed in the asymmetric hydrogenation of an electron-rich olefin such as enamide using their rhodium(I) comp
Publikováno v:
Chemical and Pharmaceutical Bulletin. 39:1085-1087
Axially dissymmetric biphenylbisphosphine ligands, BIMOP (1a) and p-MeO-BIMOP (1b) have been newly designed and prepared. The ruthenium (II) complexes of (R)-1a and 1b proved to be excellent catalysts in asymmetric hydrogenations of methyl 3-oxobutan
Publikováno v:
Chemical and Pharmaceutical Bulletin. 39:2767-2769
An optically pure atropisomeric biphenylbisphosphine, Cy-BIMOP, has been prepared, and its rhodium(I) complex showed higher catalytic activity and better enantioselectivity with the reverse configuration than BIMOP, p-MeO-BIMOP, and BINAP in the asym
Autor:
Toshiaki Morimoto, Minoru Sekiya
Publikováno v:
Chemical and Pharmaceutical Bulletin. 30:3513-3516
Deoxyobtusilactone A was synthesized from 1-tetradecene by a route involving [3, 3]-sigmatropic rearrangement of 1, 1-dichloro-2-(2-propenoxy)-1-hexadecene, followed by Favorskii rearrangement of the resulting γ, δ-unsaturated α, α-dichloroketone