申请人:NEKTAR THERAPEUTICS
公开号:US20130280783A1
公开(公告)日:2013-10-24
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.
本文提供了聚合物α-羟基醛或α-羟基酮试剂,可以与含胺化合物结合,形成稳定的共轭物,在单步反应中完成。在选定的实施例中,聚合物试剂本身包含一个内部质子抽取(碱性)功能基团,以促进更有效的反应。适当的取代基通过连接基团等方式进行定位,以将基团定位于质子抽取位置,最好在α-碳上的氢原子和抽取原子之间提供4或5键间隔。还提供了使用这些试剂和与生物活性化合物稳定、可溶化的共轭物的方法。在首选实施例中,试剂或共轭物的聚合物部分是聚乙二醇。