Benzofuran synthesis via copper-mediated oxidative annulation of phenols and unactivated internal alkynes
作者:Ruyi Zhu、Jiangbo Wei、Zhangjie Shi
DOI:10.1039/c3sc51489g
日期:——
example of copper-mediated oxidativeannulation of phenols and unactivatedinternalalkynes to afford benzofuran derivatives was reported. Various phenols and unactivatedinternalalkynes were successfully employed. Mechanistic studies disclosed a new strategy on annulations of alkynes with phenolsthrough reversible electrophilic carbocupration of phenol followed by alkyne insertion and cyclization
Palladium-Catalyzed Cross-Coupling of Benzyl Ketones and<i>α,β</i>-Unsaturated Carbonyl and Phenolic Compounds with<i>o</i>-Dibromobenzenes to Produce Cyclic Products
A number of carbonyl and phenolic compounds efficiently couple with o-dibromobenzenes in the presence of a palladium catalyst and a base to give the corresponding oxygen-containing heterocycles or carbocyclic compounds. Thus, from the reactions of benzyl phenyl ketones, 1-naphthols, and α,β-unsaturated aldehydes and ketones, benzofuran, benzopyran, benzocyclobutane, and indene derivatives, respectively, are produced selectively via the successive formation of C–C and C–O bonds or of two C–C bonds.
Synthesis, Electronic Properties, and X-ray Structural Characterization of Tetrarylbenzo[1,2-<i>b</i>:4,5-<i>b</i>′]difuran Cation Radicals
作者:Ruchi Shukla、Shriya H. Wadumethrige、Sergey V. Lindeman、Rajendra Rathore
DOI:10.1021/ol801356e
日期:2008.8.21
robust cation-radical salts of BDF derivatives confirm that a single charge in the BDFs is stabilized largely by the benzodifuran and coplanar alpha-aryl groups lying on the longitudinal axis. These findings suggest that the linear arrays of BDFs may allow the construction of molecularwires suitable for long-range electron transport.