Certain embodiments of the invention provide a method comprising treating a hydroxy-carboxylic acid compound with a compound of formula (I) in the absence of a solvent, to provide a diacid of formula (II), wherein R is a linker molecule; wherein each Y is independently a leaving group; and wherein X is a residue of a biologically active compound.
本发明的某些实施方案提供了一种方法,该方法包括在无溶剂的情况下,用式(I)化合物处理羟基
羧酸化合物,以提供式(II)的二元酸,其中 R 是连接分子;其中每个 Y 独立地是离去基团;其中 X 是
生物活性化合物的残基。