4-hydrazino-2-hydroxy-benzoic acid ethyl ester; hydrochloride 、
3-Ethoxycarbonylmethoxy-2-methyl-1,4-naphthoquinone 在
溶剂黄146 作用下,
反应 2.0h,
以50%的产率得到2-Hydroxy-4-(6-methyl-5,9-dioxo-8,9-dihydro-5H-7-oxa-10,11-diaza-cyclohepta[a]naphthalen-10-yl)-benzoic acid ethyl ester