Fangjun Zhang

Direct Synthesisof Pyrazolones via N–B BondFunctionalization: Sequential Carbonyl Insertion Using In Situ Generated N , N ′-Diborylated Hydrazines

Abstract We report a metal-free protocol for the synthesis of 1,2-diaryl pyrazol-3-ones through the strategic exploitation of N,N′-diborylated hydrazine reactivity. The transformation employs a 4,4′-bipyridyl-catalyzed system that enables in situ generation of N,N′-diborylated hy...