Strained alkynes derived from 2,2′-dihydroxy-1,1′-biaryls; synthesis and copper-free cycloaddition with azides
作者:Alessandro Del Grosso、Lavrentis-Dimitrios Galanopoulos、Cookson K. C. Chiu、Guy J. Clarkson、Peter B. O′ Connor、Martin Wills
DOI:10.1039/c7ob00991g
日期:——
A series of strained alkynes were prepared from 2,2′-dihydroxy-biaryls. Several were characterised by X-ray crystallography, revealing strained C(sp)–C(sp)–C(sp3) bond angles in the range of 163–167°. Their cycloadditions with azides proceed without a catalyst. Functionalised versions of these reagents have potential applications to materials synthesis and bioconjugations.
Aryl–aryl coupling via directed lithiation and oxidation
作者:David S. Surry、David J. Fox、Simon J. F. Macdonald、David R. Spring
DOI:10.1039/b501939g
日期:——
Aryl lithium reagents formed by directedlithiation reactions undergo transmetallation with copper(I) salts to form organocuprates, which may be efficiently oxidized to yield ortho-substituted biaryls.