title: Mild arylboronic acid catalyzed selective [4 + 3] cycloadditions: access to cyclohepta[b]benzofurans and cyclohepta[b]indoles.
abstract: The first example of arylboronic acid catalyzed [4 + 3] cycloaddition reaction is reported. 3,5-Bis-(trifluoromethyl) phenylboronic acid is shown to be the best catalyst in this reaction. The method has also enabled the preparation of cyclohepta[b]benzofurans and cyclohepta[b]indoles in excellent yields.
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China. wzheng@nju.edu.cn.
authors.forename: Kou-Sen
authors.initials: KS
authors.lastname: Cao
authors.forename: Hong-Xu
authors.initials: HX
authors.lastname: Bian
authors.forename: Wen-Hua
authors.initials: WH
authors.lastname: Zheng