反应详情

With a procedure similar to the one described in Example 1, 3 g of 1α-methylandrost-4-ene-3,17-dione, 3 ml of diethylorthoformate, 80 mg of p-toluenesulphonic acid, 1.1 ml of N-methylaniline and 1,2 ml of a 40% formic aldehyde aqueous solution give 2.34 g (75% yield) of the title compound.