methyl 5-(7-hydroxy-4-oxo-2-(trifluoromethyl)-4H-chromen-3-yl)thiophene-2-carboxylate 、
盐酸 在
水 、
二氯甲烷 、
5-(7-hydroxy-4-oxo-2-(trifluoromethyl)-4H-chromen-3-yl)thiophene-2-carboxylic acid 作用下,
以
1,4-二氧六环 为溶剂,
反应 24.0h,
以to afford the desired product in Example 2 as a gray powder (216.1mg, 76.3%)的产率得到5-(7-hydroxy-4-oxo-2-(trifluoromethyl)-4H-chromen-3-yl)thiophene-2-carboxylic acid