反应详情

Condense 2-propylcyclopentane-1,3-dione (13.1 g) in 0.12% methanolic potassium hydroxide solution (90 cc) with 6-m-methoxyphenylhex-1-en-3-one (19.0 g), to obtain crude 2-n-propyl-2-(6-m-methoxyphenyl-3-oxohexyl)cyclopentane-1,3-dione (25.5 g). Submit this Michael condensation product (23.4 g) to double cyclodehydration by heating with toluene-p-sulfonic acid, and distil the product at 200°/10-4 mm; crystallize the distillate from ethanol to obtain the tetracyclic diene ketone 13β-propyl-3-methoxygona-1,3,5(10),8,14-pentaen-17-one, m.p. 82°-84°; ultraviolet absorption peak at 310 mμ (ε24,700).