The present invention relates to processes for preparing compounds of formula I or a pharmaceutically acceptable salt or solvate thereof, wherein the dashed bond (----) at position 7 indicates that the substituent is in an α or β stereochemistry; R is hydrogen or hydroxy; and R1 is hydrogen or C1-C6 alkyl
本发明涉及制备式 I 化合物或其药学上可接受的盐或溶液的工艺,其中第 7 位的虚线键 (----) 表示取代基为 α 或 β 立体
化学结构;R 为氢或羟基;R1 为氢或 C1-C6 烷基