Intermediates of pregnane saponin P57 and derivatives thereof, preparation method and application of intermediates, and pregnane saponin P57 derivatives

The invention relates to intermediates, as shown in a formula I, for pregnane saponin P57 and derivatives thereof, a preparation method and application of the intermediates, and the pregnane saponin P57 derivatives. According to the method, synthesis of P57 and derivatives thereof is realized by adopting a convergent synthesis strategy, a synthesis route is short, yield is high, and the method is suitable for industrial production. Each substituent in the formula I is as defined in the specification. 本发明涉及式I所示的用于孕甾皂苷P57及其衍生物的中间体、制备方法和用途、及孕甾皂苷P57衍生物。该方法采用汇聚式合成策略实现了P57及其衍生物的合成，合成路线短，收率高，适合工业化生产。式I中的各取代基的定义与权利要求书中的定义相同。