1: 2.) p-TsOH / 1.) THF, room temperature, overnight, 2.) C6H6, reflux, overnight 2: 87 percent / Zn, aq. KOH / pyridine / Heating 3: 96 percent / KOH / hexamethylphosphoric acid triamide; H2O View Scheme

1: 2.) p-TsOH / 1.) THF, room temperature, overnight, 2.) C6H6, reflux, overnight 2: 87 percent / Zn, aq. KOH / pyridine / Heating View Scheme