反应详情

The intermediate 4-cyclobutyloxybenzoic acid was prepared following the procedure described in Example 108 for the preparation of the corresponding 4 -cyclopropyloxybenzoic acid using 25 g. of ethyl 4-hydroxybenzamide, 23.1 g. of cyclobutyl bromide, 31 g. of anhydrous potassium carbonate, 2.5 g. of potassium iodide and 300 ml. of dimethylformamide to yield 20.1 g. of ethyl 4-cyclobutyloxybenzoate, which was then hydrolyzed by heating with 200 ml. of 10% aqueous potassium hydroxide solution as in Example 108 to yield 12.7 g. of 4-cyclobutyloxybenzoic acid, m.p. 192°-195° C. after recrystallization from 400 ml. of acetonitrile.

1. temperaturehydrolyzed by heating with 200 ml