A method is provided for preparing a compound ƒ. The method comprises carrying out the following reaction: (i), (ii), (iii) where: PG represents a protecting group, LG represents a leaving group, and L and L' are independently selected from OH and leaving groups, or L and L' together form a group selected from -O-C(O)-O- and -O-.
提供了一种制备化合物ƒ的方法。该方法包括进行以下反应:(i)、(ii)、(iii)其中:
PG代表保护基,LG代表离去基团,L和L'独立地选择自OH和离去基团,或者L和L'共同形成从-O-C(O)-O-和-O-中选择的基团。