Intermolecular Ene Reactions Utilizing Oxazolones and Enol Ethers
摘要:
We report herein an intermolecular ene reaction using oxazolones with enol ethers which results in the formation of novel quaternary amino esters in near quantitative yields. The overall reaction transformation closely resembles an intermolecular version of the Conia-ene reaction. The reactions are uncatalyzed and occur under very mild conditions.
Palladium-Catalyzed Enantioselective Intermolecular Carboetherification of Dihydrofurans
作者:Gustavo M. Borrajo-Calleja、Vincent Bizet、Clément Mazet
DOI:10.1021/jacs.6b02158
日期:2016.3.30
A novel enantioselective Pd-catalyzed intermolecular carboetherification of dihydrofurans is reported. The in situ generation of chiral bis-phosphine mono-oxide ligands is crucial, and a general catalytic system has been identified based on this approach. It provides access to a variety of fused tetrahydrofurobenzofurans in consistently high yield and enantiomeric excess.
Process for producing 3-methyltetrahydrofuran, and process for producing an intermediate thereof
申请人:Kuraray Co., LTD
公开号:US06239295B1
公开(公告)日:2001-05-29
A process for producing 3-methyltetrahydrofuran, and processes for producing 3-hydroxy-3-methyltetrahydrofuran and 3-methyldihydrofuran, which are intermediates thereof, are provided.
Gas-phase protonation of unsaturated ethers: Experimental and theoretical study of 2,3-and 2,5-dihydrofuran and related compounds
作者:Guy Bouchoux、Faycal Djazi、Yannik Hoppilliard、Raymond Houriet、Eric Rolli
DOI:10.1002/oms.1210210407
日期:1986.4
AbstractThe protonation of 2,3‐ and 2,5‐dihydrofuran is examined in gas‐phase equilibrium proton transfer reactions conducted in an ion cyclotron resonance spectrometer. The thermodynamically favoured site of protonation in the two compounds is seen to be different: whereas the first isomer forms a carbocation upon protonation, the second isomer protonates on the oxygen atom to form an oxonium ion. The results obtained with substituted derivatives and with linear analogues confirm these conclusions. Molecular orbital calculations on the various structures for protonated bases are performed at the 4–31G level with correction for configuration interaction effects and at the 4–31G* level. The latter basis set provides the best results owing to the introduction of d‐type orbitals on the oxygen atom. The calculation results substantiate the experimental observations and provide details on the molecular structure of the protonated species.
Baird, Mark S.; Baxter, Anthony G. W.; Hoorfar, Alireza, Journal of the Chemical Society. Perkin transactions I, 1991, # 4, p. 2575 - 2582
作者:Baird, Mark S.、Baxter, Anthony G. W.、Hoorfar, Alireza、Jefferies, Ian
DOI:——
日期:——
KATRITZKY, ALAN R.;MURUGAN, RAMIAH;SISKIN, MICHAEL, ENERGY AND FUELS., 4,(1990) N, C. 538-543
作者:KATRITZKY, ALAN R.、MURUGAN, RAMIAH、SISKIN, MICHAEL