1: 35 percent / pyridine; SO2; MsCl / dimethylformamide / 20 °C 2: 37 percent Spectr. / CDCl3 / 1.5 h / Irradiation 3: 85 percent Chromat. / K2CO3 / dimethylformamide / 2 h / 120 °C View Scheme

1: 35 percent / pyridine; SO2; MsCl / dimethylformamide / 20 °C 2: 37 percent Spectr. / CDCl3 / 1.5 h / Irradiation 3: 15 percent Chromat. / K2CO3 / dimethylformamide / 2 h / 120 °C View Scheme

sodium tetrahydroborate in isopropyl alcohol Heating;