trichlorophosphate in acetonitrile Bischler-napieralski cyclization; 5 h; Heating;

1: 55.6 percent / FeSO4*7H2O, NH4OH / H2O / 3 h / Heating 2: 43.7 percent / 6 h / 154 °C View Scheme

Multi-step reaction with 3 steps 1.1: 80 percent / ammonium acetate; acetic acid / 1.5 h / Heating2.1: LiAlH4 / tetrahydrofuran / 3 h / Heating3.1: HOBt; DCC / dimethylformamide / 12 h3.2: 95 percent / dimethylformamide / 12 h  

With  ammonium hydroxide; iron(II) sulfate in  water 3 h;  Heating;