hydroxylamine hydrochloride; sodium methylate in methanol 1)room temp., overnight 2)autoclave, 120 deg C, 7h;

Multi-step reaction with 3 steps 1: 92 percent / 3-methylbutylnitrite / acetic acid; H2O / 48 h / Ambient temperature2: 84 percent / dimethylaminopyridine / stirred overnight3: 90 percent / thionyl chloride, DMF / CHCl3 / 4 h / Heating