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Your search keyword '"Ito, Jun‐ichi"' showing total 4 results
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4 results on '"Ito, Jun‐ichi"'

2. Enantioselective Direct Alkynylation of Ketones Catalyzed by Chiral CCN Pincer RhIII Complexes.

Author

Ito, Jun ‐ ichi, Ubukata, Shino, Muraoka, Shun, and Nishiyama, Hisao

Subjects
*KETONES, *ALKYNES, *ENANTIOSELECTIVE catalysis, *CARBENES, *OXAZOLINE, *LIGANDS (Chemistry)
Abstract

A direct asymmetric alkynylation of ketones with new chiral CCN Rh catalysts containing N-heterocyclic carbene and oxazoline hybrid ligands is described. The catalytic reaction of fluoroalkyl-substituted ketones, ArCOCF2X (X=F, Cl, H), with aromatic and aliphatic alkynes yielded the corresponding chiral propargyl alcohols with high enantioselectivity. Control and kinetic experiments suggested a bis(alkynyl) Rh intermediate as the active species for the C−C bond-forming step. [ABSTRACT FROM AUTHOR]

Published
2016
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3. Catalytic Hydrosilylation of Carbonyl Compounds with Zinc(II) Acetate: Asymmetric Induction Collaborated with N2S2 Ligands.

Author

Inagaki, Tomohiko, Yamada, Yoko, Phong, Le Thanh, Furuta, Akihiro, Ito, Jun-ichi, and Nishiyama, Hisao

Subjects
HYDROSILYLATION, CARBONYL group, ZINC acetate, LIGANDS (Chemistry), KETONES, ALDEHYDES, ENANTIOSELECTIVE catalysis
Abstract

Zinc acetate proved to be an efficient catalyst for hydro�silylation of ketones and aldehydes in the combination with (EtO)2MeSiH, and a good to excellent asymmetric induction was observed in the presence of chiral N2S2 ligands. [ABSTRACT FROM AUTHOR]

Published
2009
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4. Chiral Phebox–rhodium complexes as catalysts for asymmetric direct aldol reaction

Author

Inoue, Hiroko, Kikuchi, Makoto, Ito, Jun-ichi, and Nishiyama, Hisao

Subjects
*KETONES, *CHEMICAL inhibitors, *ALDEHYDES, *CATALYSTS
Abstract

Abstract: Chiral bis(oxazolinyl)phenyl–rhodium complexes act as catalysts in the combination of AgOTf for direct aldol reaction of ketones and aromatic aldehydes to give the corresponding β-hydroxyketones in high anti-selectivity and a good to high enantioselectivity up to 91% ee. [Copyright &y& Elsevier]

Published
2008
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