Copper-Catalyzed Trifluoromethylalkynylation of Isocyanides
摘要:
The title reaction proceeds with acetylenic triflones and isocyanides under mild conditions using copper as a catalyst. This transformation provides an efficient access to (E)-N-alkyl trifluoromethyl alkynyl ketoimines, which are useful building blocks for the synthesis of CF3-containing N-heterocycles, propargylamines, etc.
Unprecedented regiochemical control in the formation of aryl[1,2-a]imidazopyridines from alkynyliodonium salts: mechanistic insights
作者:Luke I. Dixon、Michael A. Carroll、Thomas J. Gregson、George J. Ellames、Ross W. Harrington、William Clegg
DOI:10.1039/c3ob41112e
日期:——
Aryl(alkynyl)iodonium salts have been demonstrated to be valuable precursors to a diverse range of heteroaromatic ring systems including aryl[1,2-a]imidazopyridines. Successful application, using the recently described aryl(alkynyl)iodonium trifluoroacetate salts, is described, highlighting for the first time that the regioselectivity of this process is both counter-ion and concentration dependent. Studies with a carbon-13 labelled substrate established that the reactions of alkynyliodonium salts are highly complex and that multiple mechanistic processes appear to be underway simultaneously.
The Benzylidenecarbene–Phenylacetylene Rearrangement: An Experimental and Computational Study
作者:Kathryn A. Moore、Jesus S. Vidaurri-Martinez、Dasan M. Thamattoor
DOI:10.1021/ja310440e
日期:2012.12.12
Benzylidenecarbene was generated from a new photochemical source, 1-benzylidene-1a,9b-dihydro-1H-cyclopropa[l]phenanthrene, in deuteratedbenzene at ambient temperature. The carbene undergoes a facile rearrangement to phenylacetylene and could not be trapped by olefins. Generation of the carbene bearing a (13)C label at the β-carbon produced phenylacetylene in which the label was found exclusively
Copper-Catalyzed Trifluoromethylalkynylation of Isocyanides
作者:Jian Lei、Xiaoxing Wu、Qiang Zhu
DOI:10.1021/acs.orglett.5b00730
日期:2015.5.15
The title reaction proceeds with acetylenic triflones and isocyanides under mild conditions using copper as a catalyst. This transformation provides an efficient access to (E)-N-alkyl trifluoromethyl alkynyl ketoimines, which are useful building blocks for the synthesis of CF3-containing N-heterocycles, propargylamines, etc.
Mechanistic aspects of the CH alkynylation reaction of acetylenic triflones. Determination of phenyl versus cyclohexyl migratory aptitude for a vinylidine carbene
作者:Jason S. Xiang、P.L. Fuchs
DOI:10.1016/0040-4039(96)01117-3
日期:1996.7
13C-2 labeled phenyl ethynyl triflone undergoes regiospecific CHalkynylation upon reaction with cyclohexane. The 13C label is found to be exclusively adjacent to the phenyl group in the product phenylcyclohexylacetylene, consistent with cyclohexyl radical addition at the α-position. Control studies show preferential phenyl migration from a vinylidinecarbene, thus excluding the presence of such