ethyl 2-(6-fluoro-4-oxochroman-3-yl)-2-oxoacetate 、
甲基肼 在
ethyl 8-fluoro-1-methyl-1,4-dihydrochromeno[4,3-c]pyrazole-3-carboxylate 、 silica 、 EtOAc hexanes 作用下,
以
乙醇 为溶剂,
反应 6.0h,
以The title compound was obtained as a white solid (421.5 mg, 1.53 mmol, 25.5% yield) that的产率得到ethyl 8-fluoro-1-methyl-1,4-dihydrochromeno[4,3-c]pyrazole-3-carboxylate