咪唑 、
4-bromo-3-tert-butoxycarbonylmethoxy-5-[3-(1-ethenesulfonyl-piperidin-4-ylamino)-phenyl]-thiophene-2-carboxylic acid methyl ester 以77%的产率得到4-bromo-3-tert-butoxycarbonylmethoxy-5-{3-[1-(2-imidazol-1-yl-ethanesulfonyl)-piperidin-4-ylamino]-phenyl}-thiophene-2-carboxylic acid methyl ester