5-(1-Ethyl-propenyl)-benzo[b]thiophene-2-carboxylic acid ethyl ester 、
邻甲酚 以
trifluoroborane diethyl ether 为溶剂,
以to afford the title compound (5.97 g, 78%)的产率得到5-[1-ethyl-1-(4-hydroxy-3-methyl-phenyl)-propyl]-benzo[b]thiophene-2-carboxylic acid ethyl ester