I've recently came across this reaction and my guess is that firstly an amide forms that later reacts with the second amine group. Is this a general reaction? Does it matter if the compounds used are aromatic?

Reaction between benzene‐1,2‐diamine and picolinic acid yielding in 2‐(pyridin‐2‐yl)‐1H‐1,3‐benzodiazole

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    $\begingroup$ This is a general reaction of diamines, aromatic or otherwise, and carboxylate groups - whether acid, esters or amides. Uusally needs high temperatures and long reaction times to give a decent yield. Good candidate for being done in a microwave reactor. $\endgroup$ – Waylander Jan 1 at 19:42

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