(NH4)2S in pyridine; ethanol 3 h; Heating;

1: 1.) potassium t-butoxide, cuprous chloride, pyridine / 1) DME, 10 min; 2) DME, 80 deg C, 4 h, room temperature, 12 h 2: 84 percent / aq. ammonium sulphide / ethanol; pyridine / 3 h / Heating View Scheme

1: 1.) potassium t-butoxide, cuprous chloride, pyridine / 1) DME, 10 min; 2) DME, 80 deg C, 4 h, room temperature, 12 h 2: 84 percent / aq. ammonium sulphide / ethanol; pyridine / 3 h / Heating View Scheme

1: 68.1 percent / tert-butyl nitrite, CuCl2 / acetonitrile / 1 h / Ambient temperature 2: 99.3 percent / iron powder, NH4Cl / ethanol; H2O / 0.5 h / Heating View Scheme