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式(III)的4,17(20)-E-孕二烯-3,16-二酮(E-
谷固醇)和式(IV)的4,17(20)-Z-孕二烯-3、式(IV)的4,17(20)-Z-孕二烯-3,16-二酮(Z-古格
雄酮)具有有效降低升高的低密度脂蛋白(LDL)和高
胆固醇水平的作用,并能从下式(I)的易得类
固醇中升高低
水平的高密度脂蛋白(HDL)。
此外,本发明还提供了一种制备上式(II)化合物的方法。