pyridine

hydrogenchloride; tin(ll) chloride in ethanol

1: 85 percent / SnCl2, cc. HCl / ethanol 2: 80 percent / P4O10 / toluene / 60 h / Heating 3: 1) n-BuLi; 2) H2O / 1) THF-hexane, -110 deg C then room temperature; 2) 0 deg C 4: 85 percent / cc HCl / ethanol / 20 h / Ambient temperature View Scheme