1: 38 percent / p-toluenesulfonylhydrazine, p-toluenesulfonic acid, sodium cyanoborohydride / dimethylformamide; tetrahydrothiophene 1,1-dioxide / 4 h / 100 °C 2: LiAlH4 / diethyl ether / 1.) r.t., 1 h, 2.) reflux, 1 h View Scheme