1: 93 percent / pyridine / 1.) R.T. 3 h, 2.) overnight View Scheme

1: 82 percent / pyridine; toluene / 7.5 h / 60 - 70 °C 2: 1.) POCl3, P2O5, 2.) NaBH4, 5M NaOH / 1.) toluene, reflux 4 h, 2.) ethanol View Scheme

1: 93 percent / pyridine / 1.) R.T. 3 h, 2.) overnight 3: 1.) 20 percent NH4OH, 2.) BBr3 / 2.) chloroform, 0 deg C, 1 h; R.T. 6 h; ethanol, 30 min. View Scheme