ethyl 4-[(2,2-dimethylpropanoyl)oxy]-1,2-dimethyl-5-(2-oxoethyl)-1H-benzimidazole-6-carboxylate 、
(indan-1-yl)triphenylphosphonium bromide 在
18-冠醚-6 、
potassium carbonate 作用下,
以
1,1-二氯乙烷 为溶剂,
反应 0.75h,
生成 5-[2-(2,3-dihydro-1H-inden-1-ylidene)ethyl]-4-[(2,2-dimethylpropanoyl)oxy]-1,2-dimethyl-1H-benzimidazole-6-carboxylate 、 5-[2-(2,3-dihydro-1H-inden-1-ylidene)ethyl]-4-[(2,2-dimethylpropanoyl)oxy]-1,2-dimethyl-1H-benzimidazole-6-carboxylate