Ti(IV) promoted 1, 3-dipolar cycloaddition of nitrones to vinyl ethers
作者:Pau Bayo´n、Pedro de March、Marta Figueredo、Josep Font
DOI:10.1016/s0040-4020(98)00983-1
日期:1998.12
The 1, 3-dipolar cycloaddition of nitrones to vinylethers is accelerated by Ti(IV) species. The efficiency of the catalyst parallels its complexation capacity. The use of Ti(iPrO)2Cl2 favours the formation of trans cycloadducts, presumably through an endo bidentate complex, in which the metal atom is simultaneously coordinated to the vinylether and to the cyclic nitrone or the Z isomer of the acyclic
Gold Catalysts Can Generate Nitrone Intermediates from a Nitrosoarene/Alkene Mixture, Enabling Two Distinct Catalytic Reactions: A Nitroso-Activated Cycloheptatriene/Benzylidene Rearrangement
作者:Sayaji Arjun More、Rahul Dadabhau Kardile、Tung-Chun Kuo、Mu-Jeng Cheng、Rai-Shung Liu
DOI:10.1021/acs.orglett.1c01857
日期:2021.7.16
Gold-catalyzedreactions of cycloheptatrienes with nitrosoarenes yield nitrone derivatives efficiently. This reaction sequence enables us to develop gold-catalyzed aerobic oxidations of cycloheptatrienes to afford benzaldehyde derivatives using CuCl and nitrosoarenes as co-catalysts (10–30 mol %). Our density functional theory calculations support a novel nitroso-activated rearrangement, tropylium