重氮甲烷 、
(1R,9aR)-9a-(2-Carboxy-ethyl)-3-methoxy-7-methyl-5-nitro-6-oxo-1,6,7,8,9,9a-hexahydro-2-oxa-7-aza-benzo[cd]azulene-1-carboxylic acid 以
甲醇 、
乙醚 为溶剂,
生成 (1R,9aR)-3-Methoxy-9a-(2-methoxycarbonyl-ethyl)-7-methyl-5-nitro-6-oxo-1,6,7,8,9,9a-hexahydro-2-oxa-7-aza-benzo[cd]azulene-1-carboxylic acid methyl ester