Oxidation of bicyclic oxazolines: applications to glycomimetics and novel saccharide derivatives
摘要:
A general procedure is reported for the oxidation Of Substituted oxazolines to alpha-acyloxyketoximes and the derived alpha-acyloxyketones. In the case of oxazolines derived from 2-acetamido-2-deoxyhexoses, the resulting 2-oximinoesters can be converted to 2-nitroglycals. (C) 2002 Elsevier Science Ltd. All rights reserved.
Ring opening of aziridines by different fluorinating reagents: three synthetic routes to .alpha.,.beta.-fluoro amines with different stereochemical pathways
Tellurium-based organic synthesis: A novel one-pot formation of 2-oxazolines from alkenes induced by amidotellurinylation
作者:Nan X. Hu、Yoshio Aso、Tetsuo Otsubo、Fumio Ogura
DOI:10.1016/0040-4039(88)85332-2
日期:1988.1
Benzenetellurinyl trifluoroacetate readily reacts with alkenes in acetonitrile in the presence of boron trifluoride etherate at 75 °C to give 2-oxazolines via amidotellurinylation.
[EN] SYNTHESIS OF OXAZOLINE COMPOUNDS<br/>[FR] SYNTHÈSE DE COMPOSÉS D'OXAZOLINE
申请人:UNIV HONG KONG POLYTECHNIC
公开号:WO2010015211A1
公开(公告)日:2010-02-11
The present invention provides an improved process for preparing an oxazoline compound of the formula: (I) wherein R1 and R2 are independently hydrogen, sulfide, sulfoxide, sulfonyl, optionally substituted lower alkyl, optionally substituted aralkyl, optionally substituted aryl or optionally substituted polycyclic arylyl; or R1 and R2 combined together with the carbon atoms to which they are attached form an optionally substituted fused 6-member aromatic ring provided that R1 and R2 are attached to carbon atoms adjacent to each other; and R3 is hydrogen, sulfide, sulfoxide, sulfonyl, optionally substituted lower alkyl, optionally substituted aralkyl, optionally substituted aryl or optionally substituted polycyclic arylyl; or an enantiomer therof; or an enantiomeric mixture therof; comprising the step of contacting an acylamino alcohol compound to a suitable amount of fluoroalkanesulfonyl fluoride compound and organic basic reagent. By using a fluoroalkanesulfonyl fluoride compound with an organic basic reagent, the present invention efficiently converts acylamino alcohol compounds into highly chemoselective oxazoline compounds with a remarkable variety of substrates, mild conditions and relatively short reaction time.
The aminolysis of meso-N-phenyl aziridines is efficiently catalyzed with just 1 mol% of Sc(OTf)3 and furnishes valuable 1,2-diamines in good to excellent yields.
Synthesis of β-Fluoroamines by Lewis Base Catalyzed Hydrofluorination of Aziridines
作者:Julia A. Kalow、Dana E. Schmitt、Abigail G. Doyle
DOI:10.1021/jo300433a
日期:2012.4.20
Lewis base catalysis promotes the in situ generation of amine-HF reagents from benzoyl fluoride and a non-nucleophilic alcohol. The hydrofluorination of aziridines to provide beta-fluoroamines using this latent HF source is described. This protocol displays a broad scope with respect to aziridine substitution and N-protecting groups. Examples of regio- and diastereoselective ring opening to access medicinally relevant beta-fluoroamine building blocks are presented.