Over the course of recent drug discovery efforts,
the unmet need for an efficient route to 4-alkyl pyrazoles was
identified. Despite an abundance of methodology for their
synthesis, pyrazoles are most commonly constructed by the
condensation of an alkyl hydrazine with a 1,3-dicarbonyl.6
However, the inherent instability of many 1,3-dicarbonyls,
particularly dialdehydes,7 limits access to substituted pyrazoles.
As a workaround, the use of vinylogous formam