The regioselective reaction of 2,2′-dihydroxybiphenyl with terminalalkynes was found to be rapidly catalyzed by InCl3 and ZrCl4. The chemoselectivity of catalysts and alkynes for biphenol over water, together with the reaction mechanism are discussed in details.
An Efficient and Practical Synthesis of Dibenzo[d,f][1,3]-dioxepines from 2,2′-Dihydroxybiphenyl with Terminal Alkynes Catalyzed by Lewis Acid TiCl<sub>4</sub>
作者:Haisheng Wu、Jin Yang、Lei Wang
DOI:10.1002/cjoc.201190225
日期:2011.6
A synthetic strategy toward the cyclic addition of 2,2′‐dihydroxybiphenyl to terminalalkynes has been developed using LewisacidTiCl4 as catalyst. The reactions generated dibenzo[d,f][1,3]dioxepines derivatives in good yields with excellent regio‐selectivity in the presence of catalytic amount of TiCl4 under mild reaction conditions.