Expedient synthesis of oseltamivir and related compounds via direct olefin diazidation-diamidation reaction
申请人:GEORGIA STATE UNIVERSITY RESEARCH FOUNDATION, INC.
公开号:US10385010B1
公开(公告)日:2019-08-20
Disclosed herein are improved methods for the preparation of oseltamivir, and intermediates useful thereto.
本文披露了改进的奥司他韦制备方法,以及与之有关的有用中间体。
Arene ruthenium complexes with pyridyloxazolines: synthesis and applications as asymmetric catalysts for Diels–Alder reactions †
作者:Adam J. Davenport、David L. Davies、John Fawcett、Shaun A. Garratt、David R. Russell
DOI:10.1039/b006530g
日期:——
Reaction of the dimers [RuCl2(arene)]2 with pyridyloxazolines (pymox) gave complexes [RuCl(pymox)(arene)][SbF6] 1â12 which have been fully characterised. Using chiral ligands diastereomers are formed, the diastereoselectivity depending on the substituents on the arene and on the oxazoline. The complexes [RuCl(Me2-pymox)(mes)][SbF6] 1, [RuCl(Ph-pymox)(mes)][SbF6] 3, [RuCl(iPr-pymox)(mes)][SbF6] 5 and [RuCl(indanyl-pymox)(mes)][SbF6] 12 (mes = mesitylene) have been characterised by X-ray crystallography. Treatment of these cations with AgSbF6 generates dications which in some cases can be isolated as aqua species [Ru(OH2)(pymox)(arene)]2+; these dications are enantioselective catalysts for DielsâAlder reactions of acroleins and dienes; a mechanism is proposed which accounts for the observed enantioselectivity.
Regio- and Enantioselective Allylation of Phenols<i>via</i>Decarboxylative Allylic Etherification of Allyl Aryl Carbonates Catalyzed by (Cyclopentadienyl)ruthenium(II) Complexes and Pyridine-Hydrazone Ligands
作者:Léo Egger、Cecilia Tortoreto、Thierry Achard、David Monge、Abel Ros、Rosario Fernández、José M. Lassaletta、Jérôme Lacour
DOI:10.1002/adsc.201500534
日期:2015.10.12
(Cyclopentadienyl)tris(acetonitrile)ruthenium hexafluorophosphate [CpRu(CH3CN)3][PF6] in combination with pyridine-hydrazone ligands efficiently catalyzes the asymmetric decarboxylative allylic rearrangement of allylarylcarbonates. Formation of CO bonds with high regio- and enantioselectivity ratios (up to 95:5 and 98% ee) is obtained. Good stereocontrol of the pseudotetrahedral geometry of the CpRu
Enantioselective Construction of Trifluoromethoxylated Stereogenic Centers by a Nickel-Catalyzed Asymmetric Suzuki-Miyaura Coupling of Secondary Benzyl Bromides
作者:Weichen Huang、Xiaolong Wan、Qilong Shen
DOI:10.1002/anie.201706868
日期:2017.9.18
Trifluoromethoxy‐substituted stereogeniccenters can be constructed with high enantioselectivity by a nickel‐catalyzed Suzuki–Miyaura coupling of readily available α‐bromobenzyl trifluoromethyl ethers with a variety of aryl pinacol boronates. The coupling proceeds under mild reaction conditions, and a variety of common functional groups, such as fluoride, chloride, bromide, ester, enolizable ketone