2-甲氧基乙胺 、
methyl 5-[N-acetyl-N-(2-methoxyethyl)amino]-4,7-dihydro-4,7-dioxobenzo[b]thiophene-2-carboxylate 在
silica gel 、
ethyl acetate n-hexane 作用下,
以
四氢呋喃 为溶剂,
反应 6.5h,
以to give methyl 5-[N-acetyl-N-(2-methoxyethyl)amino]-4,7-dihydro-6-(2-methoxyethyl)amino-4,7-dioxobenzo[b]thiophene-2-carboxylate (0.39 g) as a reddish purple oil的产率得到methyl 5-[N-acetyl-N-(2-methoxyethyl)amino]-4,7-dihydro-6-(2-methoxyethyl)amino-4,7-dioxobenzo[b]thiophene-2-carboxylate