Chiral Vanadium Complexes Research Articles

Catalytic and enantioselective oxa-Piancatelli reaction using a chiral vanadium complex.

An enantioselective oxa-Piancatelli reaction was established for the first time using a chiral vanadium(v) catalyst. The dual Brønsted and Lewis acid properties of the vanadium catalyst afforded 4-hydroxycyclopent-2-enone derivatives in up to 90% yields and with 93 : 7 enantiomeric ratios, as well as >20 : 1 diastereomeric ratios.

ChemInform Abstract: Enantioselective Oxidative‐Coupling of Polycyclic Phenols.

AbstractAxially chiral vanadium complexes catalyze the enantioselective oxidative‐coupling of polycyclic phenols to biphenols.

ChemInform Abstract: Enantioselective Pinacol Coupling Reaction of Aromatic Aldehydes Catalyzed by Chiral Vanadium Complexes.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Enantioselective pinacol coupling reaction of aromatic aldehydes catalyzed by chiral vanadium complexes

The asymmetric pinacol coupling of aromatic aldehydes by chiral salan–vanadium complexes as effective catalysts is reported. Chiral 1,2-diols were obtained with high diastereoselectivities (up to 90/10) and moderate to high enantioselectivities (up to 82% ee). The possible mechanism of the pinacol coupling reaction is also discussed.

Asymmetric sulfoxidation of prochiral sulfides using aminoalcohol derived chiral C3-symmetric trinuclear vanadium Schiff base complexes

A series of trimeric variants of the efficient and well known Bolm’s chiral vanadium salen catalysts are reported. These C3-symmetric trinuclear chiral Schiff bases were synthesized by condensing a variety of trialdehydes with optically active aminoalcohols. The catalytic activity of the chiral vanadium complexes of these ligands was investigated for the enantioselective oxidation of prochiral sulfides using hydrogen peroxide as an oxidant. The procedure afforded the corresponding sulfoxide in good yield and the enantioselectivities were comparable to those obtained with the mononuclear complexes.

Vanadium-catalyzed Enantioselective Sulfoxidation of Methyl Aryl Sulfides with Hydrogen Peroxide as Terminal Oxidant

Chiral vanadium complex prepared in situ from VO(acac)2 and Schiff base 9 was found to be an efficient catalyst for oxidation of various methyl aryl sulfides with hydrogen peroxide as terminal oxidant. For example, oxidation of methyl 2-naphthyl sulfide using a VO(acac)2, 9, and hydrogen peroxide system proceeded with high enantioselectivity of 93% ee as well as acceptable chemical yield.

ChemInform Abstract: Asymmetric Oxidation of Dithioacetals and Dithioketals Catalyzed by a Chiral Vanadium Complex.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Asymmetric Oxidation of Dithioacetals and Dithioketals Catalyzed by a Chiral Vanadium Complex

Asymmetric Oxidation of Dithioacetals and Dithioketals Catalyzed by a Chiral Vanadium Complex