Synthesis of trisubstituted hydrazine via MnO_2-promoted oxidative coupling of N,N-disubstituted hydrazine and boronic ester

摘要

A MnO_2-promoted oxidative coupling process between N,N-di-substituted hydrazine and boronic ester is reported. A 1,1-diazene species is firstly generated upon oxidation of a hydrazine substrate in the presence of MnO_2 which then interacts with boronic ester to form the key intermediate boron-ate complex, followed by migration from boron to nitrogen to form a new C-N bond. This new finding provides mild, scalable, and operationally straightforward access to trisubstituted hydrazine.