Tandem Thien- and Benzannulations of α-Alkenoyl-α-alkynyl Ketene Dithioacetals with Cyanoacetates: Synthesis of Functionalized Benzo[<i>b</i>]thiophenes
作者:Wenbo Ming、Xiaocui Liu、Lianjie Wang、Jun Liu、Mang Wang
DOI:10.1021/acs.orglett.5b00523
日期:2015.4.3
A novel domino annulation strategy for the construction of benzo[b]thiophenes has been developed. In the presence of Cs2CO3 and Ag2CO3, a wide range of alpha-alkenoyl-alpha-alkynyl ketene dithioacetals readily react with cyanoacetates in CH3CN at 110 degrees C under N-2 to afford multisubstituted benzo[b]thiophenes efficiently via tandem thien- and benzannulations. A plausible mechanism is also proposed.