2-[(4-Ethyl-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-ylamino)-methylene]-malonic acid diethyl ester 在
diphenyl ether-biphenyl eutectic 作用下,
反应 8.0h,
以75%的产率得到9-Ethyl-4,10,10-trioxo-9,10-dihydro-4H-10λ
6-thia-1,4a,9-triaza-anthracene-3-carboxylic acid ethyl ester