Abstract
AbstractSeveral oxamates were prepared from ethyl oxalyl chloride and 5‐amino‐4‐cyanopyrazoles substituted in the 1‐position with aryl, aroyl and arylsulfonyl groups. Both aroyl and arylsulfonyl groups suffered chloride‐induced cleavage during this process. The synthesis of 7‐(6‐chloro‐3‐pyridazinyl)‐7H‐pyrazolo[3,4‐d]‐1,2,3‐tri‐azin‐4(3H)‐one (11) and its reaction with methanol to give 1‐(6‐chloro‐3‐pyridazinyl)‐5‐methoxy‐1H‐pyrazole‐4‐carboxamide (12) are also reported. A mechanism for this interesting transformation is presented.
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