371945-06-1
3-氨基-呋喃并[2,3-B]嘧啶-2-甲酸乙酯
+
1189-71-5
氯磺酰异氰酸酯
→
~40%
1235181-59-5
1H-pyrido[2,3]furo[2,4-b]pyrimidine-2,4-dione
6602-54-6
2-氯-3-氰基吡啶