in ethanol Condensation; cyclization; 1 h; Heating;

1: 1.) NaH / 1.) toluene, below 20 deg C, 2.) toluene, overnight 2: p-TsOH / toluene / 18 h / Heating 3: toluene / 18 h / Ambient temperature 4: methanol / 18 h / Heating View Scheme

1: 96 percent / xylene / 1 h / Heating 2: 90 percent / ethanol / 1 h / Heating View Scheme

in methanol 18 h; Heating; Yield given. Yields of byproduct given;