1: 70 percent / glacial AcOH / ethanol / 5 h / Heating 2: 1) glacial AcOH, HCl, NaNO2 2) pyridine / 1) water, 0-5 deg C 2) r.t., overnight View Scheme

1: 65 percent / glacial AcOH / ethanol / 5 h / Heating 2: 1) glacial AcOH, HCl, NaNO2 2) pyridine / 1) water, 0-5 deg C 2) r.t., overnight View Scheme