Abstract
AbstractAn efficient protocol for the synthesis of fluorescent 4‐amino‐1,3′‐bipyrazoles, which are substituted at the positions N‐1′, C‐4′, C‐3 and C‐5, is described. By a two‐step synthetic strategy, an initial azo coupling of ethyl cyanoacetate and various 1‐alkylpyrazolyldiazonium chlorides gave substituted ethyl 2‐cyano‐2‐(2‐(pyrazol‐3‐yl)hydrazine‐ylidene)acetates, which were subsequently subjected to Thorpe‐Ziegler type cyclisation reactions to yield the title compounds.
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