Zobrazeno 1 - 10
of 32
pro vyhledávání: '"CBS catalyst"'
Publikováno v:
Chemistry Letters. 46:740-743
An efficient and mild synthetic route to (R)-phenylephrine hydrochloride using Corey–Bakshi–Shibata (CBS) catalyst was reported. In order to avoid a lengthy recovery process of the catalyst from homogeneous reaction, a polymer-supported CBS catal
Publikováno v:
Chemistry - A European Journal. 22:13171-13180
The effect of several Lewis acids on the CBS catalyst (named after Corey, Bakshi and Shibata) was investigated in this study. While (2) H NMR spectroscopic measurements served as gauge for the activation capability of the Lewis acids, in situ FT-IR s
Publikováno v:
Tetrahedron Letters. 57:2492-2495
Two novel tricyclic 1,3,2-oxazaborolidines were synthesized in seven steps from methyl Boc- l -pyroglutamate. They are characterized by an ortho- and peri-fused 5/5/6-ring system with the B–N bond forming one ring junction. In the asymmetric borane
Publikováno v:
ChemInform. 47
Two novel tricyclic 1,3,2-oxazaborolidines were synthesized in seven steps from methyl Boc- l -pyroglutamate. They are characterized by an ortho- and peri-fused 5/5/6-ring system with the B–N bond forming one ring junction. In the asymmetric borane
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Autor:
Ryo C. Yanagita, Yasuhiro Kawanami
Publikováno v:
Molecules : A Journal of Synthetic Chemistry and Natural Product Chemistry
Molecules, Vol 23, Iss 10, p 2408 (2018)
Molecules, Vol 23, Iss 10, p 2408 (2018)
Oxazaborolidine catalyst (CBS catalyst) has been extensively used for catalytic borane reduction with a predictable absolute stereochemistry and high enantioselectivity. However, the use of isolated CBS catalyst sometimes has the drawback of low repr
Autor:
Saori Shiraki, Michael D. Price, Michael C. Varela, Neil E. Schore, Mark J. Kurth, Patrick E. Berget, Seth Dixon, Jeffrey E. Merit
Publikováno v:
Tetrahedron. 63:3334-3339
Two polymer-supported versions of the Corey, Bakshi, and Shibata (CBS) catalyst were prepared and examined. Polymeric beads, with the auxiliary bound in pendant and crosslinked fashion, were prepared utilizing an improved procedure based upon earlier
Publikováno v:
The Journal of Organic Chemistry. 70:4652-4658
Highly enantioselective reduction of five-, six-, seven-, and eight-membered prochiral 1,3-cycloalkanediones possessing a methyl group and a protected hydroxymethyl group at their C2 position with baker's yeast or CBS catalyst and a new efficient and
Autor:
Jean-Claude Daran, Jean-Claude Fiaud, Philippe Dorizon, Catherine Rucker Martin, Henri B. Kagan
Publikováno v:
Tetrahedron: Asymmetry. 12:2625-2630
The kinetic resolution of 4-acetyl[2.2]paracyclophane has been realized by borane reduction in the presence of a CBS catalyst. The structure of the two diastereomeric alcohol products has been established. The ketone was recovered in more than 99% e.
Autor:
Anmin Tian, Ming Li
Publikováno v:
Journal of Molecular Structure: THEOCHEM. 544:25-35
In the present paper, the ab initio molecular orbital computations of the enantioselective reduction of 3,3-dimethyl butanone-2 with borane catalyzed by chiral oxazaborolidine (the CBS catalyst) are performed by means of the Hartree–Fock method at