The present invention relates to a method for selective preparing 4,17 (20)-E-pregnadiene-3,16-dione (E-guggulsterone) of the formula (III) and 4,17 (20)-Z-pregnadiene-3,16-dione (Z-guggulsterone) of the formula (IV) having an effect of lowering the elevated low density lipoprotein (LDL) and high levels of the cholesterol effectively, and elevating the low levels of the high density lipoprotein (HDL) from a easy-available steroid of the following formula (I). Also, the present invention provides a method for preparation of the compound of the above formula (II).
本发明涉及一种选择性制备具有降低升高的低密度脂蛋白(LDL)和
胆固醇高
水平的有效作用,并提高高密度脂蛋白(HDL)低
水平的4,17(20)-E-孕甾二烯-3,16-二酮(E-谷胱
甾醇)的方法,以及具有以下结构式(I)的易获得类
固醇制备4,17(20)-Z-孕甾二烯-3,16-二酮(Z-谷胱
甾醇)的方法。此外,本发明提供了上述结构式(II)化合物的制备方法。