The present invention provides among other things methods for preparing polymeric reagents, wherein the method comprises (a) providing an aromatic moiety bearing a hydroxy group, a first amino group and a second amino group; (b) reacting a functional group reagent with the hydroxy group to result in a hydroxy group bearing a functional group capable of reacting with an amino group of an active agent and resulting in a hydolyzable carbamate; and (c) reacting a plurality of poly(alkylene glycol) water-soluble polymers bearing a reactive group with the first amino group and second amino group to result in (i) a first amino group bearing a water-soluble polymer through a spacer moiety, and (ii) a second amino group bearing a second water-soluble polymer through a spacer moiety.
本发明提供了制备高分子试剂的方法,其中该方法包括:(a)提供一种带有羟基、第一
氨基和第二
氨基的芳香基团;(b)将一个官能团试剂与羟基反应,结果得到带有官能团的羟基,该官能团能够与活性剂的
氨基反应,并产生可
水解的
碳酸酯;(c)将多种聚(烷基
乙二醇)
水溶性高分子带有反应基团与第一
氨基和第二
氨基反应,结果得到(i)通过间隔基团与第一
氨基结合的
水溶性高分子,和(ii)通过间隔基团与第二
氨基结合的第二种
水溶性高分子。