Abstract
The base (NaH)-promoted Michael addition of N-arylhydrazones (AHs) with 1,2-diaza-1,3-dienes (DDs) produces unprecedented β-azohydrazone adducts. Strategically, the use of AHs as acyl anion equivalents (d(1) synthon) and DDs as α-electrophiles (a(2) synthon) of carbonyl compounds open the way to two important classes of pyrazole compounds.
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