Purpose To prepare trenbolone acetate in five steps from estra 4,9 diene 3,17 dione. Methods Estra 4,9 diene 3,17 dione(1) was treated with methanol in the presenece of p? toluenesulfonic acid to give 3,3?

• 目的 由雌甾 4,9 二烯 3 ,1 7 二酮 (1 )经五步合成醋酸群勃龙 (6)。