tetrabutyl ammonium fluoride in N,N-dimethyl-formamide 18 h; Ambient temperature; Yield given. Yields of byproduct given;

1: 61 percent / 100percent hydrazine hydrate / ethanol / 3 h / Heating 2: 66 percent / triethylamine / CH2Cl2 / Ambient temperature; overnight View Scheme

With  hydrazine hydrate in  ethanol 3 h;  Heating;