Synthesis of N‐Aryl‐ and N‐Alkenylhydrazides through C(sp²)−N Bond Construction

Abstract

N‐Aryl‐ and N‐alkenylhydrazides, which include a C(sp2)‐N−N motif, have attracted considerable attention not only in biologically active molecules but also because of their extensive technical applications in organic synthesis. C(sp2)−N bond construction protocols using an N‐acylhydrazine or azocarboxylic ester as the hydrazide source provide a powerful route to these compounds. These protocols exhibit different selectivity manner for the C(sp2) moiety and the regioselectivity issue of the N−N bond. This Minireview documents the available methods that have been developed based on different starting materials. The features and drawbacks of each subdivisional methodology are demonstrated.