title: Double Stereodifferentiation in the Asymmetric Dihydroxylation of Optically Active Olefins.
abstract: A study of the stereochemical control on the asymmetric dihydroxylation of the double bond of optically active vinyl epoxides and their derivatives (bromo derivatives, azido derivatives, and vinyl aziridines) was carried out and the obtained results are herein reported. The most interesting results were obtained on trans α,β-unsaturated epoxy esters, which were successfully converted with a diastereomeric ratio >80% into the corresponding diols using either the matched or the mismatched conditions, depending on the ligand used. Unprotected bromo derivatives and unprotected aziridines did not afford significant results, while for the protected bromo derivatives, azido derivatives, and N-Boc protected aziridines the matched conditions led to a diastereomeric ratio >95%. Chirality 28:387-393, 2016. © 2016 Wiley Periodicals, Inc.
authors.affiliation: CNR-IBPM, Department of Chemistry, "Sapienza" University of Rome, Rome, Italy.
authors.forename: Giuliana
authors.initials: G
authors.lastname: Righi
authors.affiliation: CNR-IBPM, Department of Chemistry, "Sapienza" University of Rome, Rome, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Bovicelli
authors.affiliation: Department of Chemistry, "Sapienza" University of Rome, Rome, Italy.
authors.forename: Ilaria
authors.initials: I
authors.lastname: Tirotta
authors.affiliation: Department of Chemistry, "Sapienza" University of Rome, Rome, Italy.
authors.forename: Carla
authors.initials: C
authors.lastname: Sappino
authors.affiliation: Department of Chemistry, "Sapienza" University of Rome, Rome, Italy.
authors.forename: Emanuela
authors.initials: E
authors.lastname: Mandic'
keywords: asymmetric dihydroxylation; double stereodifferentiation; vinyl azido alcohol; vinyl aziridine; vinyl epoxide