Ambient Benzotriazole Ring Opening through Intermolecular Radical Addition to Vinyltriazole
摘要:
Radical addition to vinyltriazole was developed as a new approach to achieve 1,2,3-triazole ring opening under mild conditions. Through reagent control, excellent chemoselectivity was achieved, giving either nitrile under basic conditions or quinoxaline under neutral conditions. Reactivities made this method an attractive new reaction mode.
An organoselenium-catalyzed N1- and N2-selective aza-Wacker reaction of alkenes with benzotriazoles is reported, which provides easy access to N1- and N2-olefinated benzotriazole derivatives. The wide substrate scope, good functional group tolerance, and facile scale-up of this method are expected to promote its potential application in synthetic chemistry. A preliminary mechanism is proposed to explain
Benzyne Click Chemistry: Synthesis of Benzotriazoles from Benzynes and Azides
作者:Feng Shi、Jesse P. Waldo、Yu Chen、Richard C. Larock
DOI:10.1021/ol800675u
日期:2008.6.1
A variety of substituted benzotriazoles have been prepared by the [3 + 2] cycloaddition of azides to benzynes. The reaction scope is quite general, affording a rapid and easy entry to substituted, functionalized benzotriazoles under mild conditions.
1-Vinylbenzotriazoles give indoles on flash vacuum pyrolysis, but depending on the vinyl substituents side reactions leading to N-phenylketenimines or benzonitrile are observed. The latter process occurs with 1,2-disubstituted vinyl groups and an azatrimethylenemethane is suggested as an intermediate. Ketenimine formation is associated with vinyl groups bearing an α-hydrogen and is the only pathway
Electrochemical C(sp<sup>2</sup>)–H/N–H “formal” cross-dehydrogenative coupling of olefins with benzotriazoles for synthesis of <i>N</i>-vinyl benzotriazoles
nBu4NI serves as both electrolyte and iodine mediator in the method, which is characterized by its simple operation (undivided electrolytic cells at room temperature), good atom efficiency, and eco-friendliness, with hydrogen as the sole byproduct.
n
在该方法中,Bu4NI 既是电解质,又是碘介质。该方法的特点是操作简单(室温下的不分区电解槽)、原子效率高、环保,唯一的副产品是氢气。