Methods are provided for preparing a compound with a fused ring structure of formula (XIV) which comprises one or more reactions starting from a 21-cyano compound of formula (XVI) where typically: R1 is an amidomethylene group or an acyloxymethylene group; R?5 and R8¿ are independently chosen from -H, -OH or -OCOCH¿2?OH, or R?5 and R8¿ are both keto and the ring A is a p-benzoquinone ring; R?14a and R14b¿ are both -H ozone is -H and the other is -OH, -OCH¿3? or -OCH2CH3, or R?14a and R14b¿ together form a keto group; and R?15 and R18¿ are independently chosen from -H or -OH, or R?5 and R8¿ are both keto and the ring A is a p-benzoquinone ring. In modified starting materials, the 21-cyano group can be replaced by other groups introduced using nucleophilic reagents.
提供了制备具有融合环结构的化合物的方法,其
化学式为(XIV),其中包括从
化学式为(XVI)的21-
氰基化合物开始的一个或多个反应,其中通常:R1是酰胺亚甲基基团或酰氧亚甲基基团;R5和R8分别选择自-H、-OH或-OCOCH2OH,或R5和R8都是酮基且环A是
对苯二酚环;R14a和R14b都是-H或一个是-H而另一个是-OH、-OCH3或-OCH2CH3,或R14a和R14b一起形成酮基;R15和R18分别选择自-H或-OH,或R5和R8都是酮基且环A是
对苯二酚环。在修改的起始材料中,21-
氰基团可以被其他使用亲核试剂引入的基团所取代。