Provided herein are polymeric α-hydroxy aldehyde or α-hydroxy ketone reagents which can be conjugated to amine-containing compounds to form stable conjugates in a single-step reaction. In selected embodiments, the polymeric reagent itself incorporates an internal proton-abstracting (basic) functional group, to promote more efficient reaction. The substituent is appropriately situated, via a linker if necessary, to position the group for proton abstraction, preferably providing a 4- or 5-bond spacing between the abstracting atom and the hydrogen atom on the α-carbon. Also provided are methods of using the reagents and stable, solubilized conjugates of the reagents with biologically active compounds. In preferred embodiments, the polymeric component of the reagent or conjugate is a polyethylene glycol.
本文提供的聚合物 α-羟基醛或α-羟基酮试剂可与含胺化合物共轭,在单步反应中形成稳定的共轭物。在选定的实施方案中,聚合物试剂本身含有一个内部质子萃取(碱性)官能团,以促进更有效的反应。该取代基的位置适当,必要时可通过连接剂将该基团置于质子萃取位置,萃取原子与 α 碳上的氢原子之间最好有 4 或 5 个键的间距。此外,还提供了试剂的使用方法以及试剂与
生物活性化合物的稳定、可溶性共轭物。在优选的实施方案中,试剂或共轭物的聚合物成分是聚
乙二醇。