1: pyridine / 1.) 35 deg C, 1 h, 2.) r.t., 10 h 2: p-TsOH*H2O / methanol / 5 h / 60 °C 3: pyridine / 2 h / Ambient temperature 4: benzylamine, diethylamine 5: SOCl2 / 2 h / Ambient temperature 6: H2, sodium formate / 5percent Pd/C / tetrahydrofuran; methanol / 6 h / Ambient temperature View Scheme

1: pyridine / 1.) 35 deg C, 1 h, 2.) r.t., 10 h 2: p-TsOH*H2O / methanol / 5 h / 60 °C 3: pyridine / 2 h / Ambient temperature 4: benzylamine, diethylamine View Scheme