3-吡啶羧酸,4-乙氧基乙酯 、 p-toluenesulphonic acid (5-methoxybenzocyclobuten-1-yl)methyl ester 以
乙醇 为溶剂,
反应 72.0h,
以1-[(5-methoxy- benzocyclobuten-1-yl)methyl]-3-ethoxycarbonyl-4-ethoxypyridinium tosylate is obtained in the form of a light-yellow foam的产率得到1-[(5-methoxybenzocyclobuten-1-yl)methyl]-4-ethoxy-3-ethoxycarbonylpyridinium tosylate