1: 43 percent / NaH, LiClO4 / dioxane / 20 h / Heating 2: 98 percent / toluene-p-sulphonic acid, hydrogen / 5percent Pd-C / ethanol / 30 °C / 2280 Torr 3: 16 percent / pyridine / benzene / 1 h, rt., then 2 h, reflux View Scheme

1: 43 percent / NaH, LiClO4 / dioxane / 20 h / Heating 2: 98 percent / toluene-p-sulphonic acid, hydrogen / 5percent Pd-C / ethanol / 30 °C / 2280 Torr 3: 16 percent / pyridine / benzene / 1 h, rt., then 2 h, reflux View Scheme

1: 98 percent / toluene-p-sulphonic acid, hydrogen / 5percent Pd-C / ethanol / 30 °C / 2280 Torr 2: 16 percent / pyridine / benzene / 1 h, rt., then 2 h, reflux View Scheme

pyridine in benzene 1 h, rt., then 2 h, reflux;