2-(4-nitro-phenyl)-4-thioxo-5,6-dihydro-4H-1-oxa-3b,5,6-triaza-cyclopenta[a]inden-7-one 、
4-溴丁酸乙酯 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 4-[2-(4-Nitro-phenyl)-7-oxo-4-thioxo-4,5-dihydro-7H-1-oxa-3b,5,6-triaza-cyclopenta[a]inden-6-yl]-butyric acid ethyl ester 、 4-[2-(4-nitro-phenyl)-7-oxo-4-thioxo-6,7-dihydro-1-oxa-3b,5,6-triaza-cyclopenta[a]inden-5-yl]-butyric acid ethyl ester