1: With pyridine; oxalyl dichloride; N,N-dimethyl-formamide in tetrahydrofuran; dichloromethane; acetonitrile T=-55 - 20°C; 3 h; 2: With copper(l) iodide; lithium tri-t-butoxyaluminum hydride in tetrahydrofuran; acetonitrile T=-78 - -70°C; 0.5 h; 3: With hydrogenchloride; water in tetrahydrofuran; acetonitrile T=-70 - 20°C;

sodium carbonate in ethylene glycol T=160°C; 0.166667 h;

sulfur in various solvent(s) 2 h; Heating;

1: 95 percent / pyridine 2: 56 percent / Na2CO3 / ethane-1,2-diol / 0.17 h / 160 °C View Scheme

1: 95 percent / N2H4*H2O / 1 h / 110 °C 2: 95 percent / pyridine 3: 56 percent / Na2CO3 / ethane-1,2-diol / 0.17 h / 160 °C View Scheme

1: 56 percent / NaBH4 / methanol / -78 °C 2: 1.) POCl3, 2.) KOAc / 1.) CH2Cl2, reflux, 40 min, 2.) CH2Cl2, water, reflux, 20 min 3: 55 percent / sulfur / various solvent(s) / 2 h / Heating View Scheme

1: 1.) POCl3, 2.) KOAc / 1.) CH2Cl2, reflux, 40 min, 2.) CH2Cl2, water, reflux, 20 min 2: 55 percent / sulfur / various solvent(s) / 2 h / Heating View Scheme

Pd-BaSO4; xylene T=165 - 170°C; Hydrogenation;