This invention relates to processes for the preparation of 7-carboxy substituted steroid compounds of Formula I,
1
wherein R
1
is selected from H or COR
4
;
R
4
is C
1
-C
6
alkyl or C
1
-C
6
alkoxy;
R
3
is C
1
-C
6
alkyl;
Z
1
is —CH
2
— or
2
wherein O—COR
4
is in the &agr; configuration;
Z
2
is —CH—;
or Z
1
and Z
2
may be taken together to form a carbon-carbon double bond;
Q is
3
These intermediates are useful in the preparation of 7-carboxy substituted steroid compounds, and particularly, the invention is directed to novel and advantageous methods for the preparation of 9,11-&agr;-epoxy-17-&agr;-hydroxy-3-oxopregn-4-ene-&agr;-7-21-dicarboxylic acid, &ggr;-lactone, methyl ester (eplerenone; epoxymexrenone).
本发明涉及制备式I中7-羧基取代类
固醇化合物的方法,其中R1选择自H或COR4;R4是C1-C6烷基或C1-C6烷氧基;R3是C1-C6烷基;Z1是—
CH2—或2其中O—COR4以α构型存在;Z2是—CH—;或Z1和Z2可以结合形成碳-碳双键;Q是3这些中间体在制备7-羧基取代类
固醇化合物中有用,特别是本发明针对制备9,11-α-环氧-17-α-羟基-3-酮孕-4-烯-α-7-21-二
羧酸,γ-内酯,甲酯(
依普利酮;环氧美克酮)的新颖和有利的方法。