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.
Copper-free ‘click’: 1,3-dipolar cycloaddition of azides and arynes
作者:Lachlan Campbell-Verduyn、Philip H. Elsinga、Leila Mirfeizi、Rudi A. Dierckx、Ben L. Feringa
DOI:10.1039/b812403e
日期:——
Arynes formed through fluoride-promoted ortho-elimination of o-(trimethylsilyl)aryl triflates can undergo [3 + 2] cycloaddition with various azides to form substituted benzotriazoles. The rapid reaction times and mild conditions make this an attractive variation of the classical 'click' reaction of azides and alkynes.
Microwave-assisted benzyne-click chemistry: preparation of 1H-benzo[d][1,2,3]triazoles
作者:Haribabu Ankati、Ed Biehl
DOI:10.1016/j.tetlet.2009.06.004
日期:2009.8
[3+2] cycloadditions of various azides to benzyne, 3-methoxybenzyne, and 4,5-difluorobenzyne. In the three-component reaction, the aryne is generated, in the presence of an azide prepared in situ, by the reaction of an o-(trimethylsilylaryl) triflate with either CsF or KF/18-Crown-6. However, in the two-component reactions, a freshly prepared azide is added to the reaction vessel prior to aryne generation
Substituted benzotriazoles are preparedfrom arynes and azides in a metal‐free [3+2] cycloaddition within minutes. Using a flow reactor, thermal strain of hazardous azides is minimized for a readily scalable and safe process.