The invention provides a carrier-linked prodrugs, wherein the biologically active moieties comprise at least one carboxylic acid and wherein the linkage between the drug moiety and linker is in the form of an ester wherein the hydroxyl group required for ester formation is provided by the linker moiety and the carboxyl group required for ester formation is provided by the drug moiety. The hydroxyl group of the linker is sterically hindered by the presence of an alkyl or aryl group on the carbon directly bound to or adjacent to the carbon carrying the hydroxyl group (α-carbon). The steric effect of the alkyl or aryl group enables greater control of the rate of hydrolytic degradation of such carrier-linked prodrugs.
这项发明提供了一种载体连接的前药,其中
生物活性基团至少包括一个
羧酸,并且药物基团和连接剂之间的连接形式为酯,酯形成所需的羟基由连接剂基团提供,酯形成所需的羧基由药物基团提供。连接剂的羟基由直接连接到或邻近携带羟基的碳上的烷基或芳基所引起的立体位阻。烷基或芳基的立体效应能够更好地控制这类载体连接的前药的
水解降解速率。