To provide a hydrophilic polymer derivative having an acetal linker whose hydrolysis rate at pH of a weakly acidic environment in the living body can be accurately controlled, and which does not liberate a low molecular weight substance other than the hydrophilic polymer chain and the drug or the like connected, more specifically, a low molecular weight aldehyde, at the time of hydrolysis. The present invention relates to a hydrophilic polymer derivative having a cyclic benzylidene acetal linker represented by the following formula (1):
wherein R1 and R6 are each independently a hydrogen atom or a hydrocarbon group; R2, R3, R4 and R5 are each independently an electron-withdrawing or electron-donating substituent or a hydrogen atom; X1 is a chemically reactive functional group; P is a hydrophilic polymer; s is 1 or 2, t is 0 or 1, and s + t is 1 or 2; w is an integer of 1 to 8; and Z1 and Z2 are each independently a selected divalent spacer.
提供一种具有
缩醛连接体的亲
水性聚合物衍
生物,其在
生物体内弱酸性环境的 pH 值下的
水解速度可精确控制,并且在
水解时不会释放出除亲
水性聚合物链和药物或类似物连接的低分子量物质,更具体地说,不会释放出低分子量醛。本发明涉及一种亲
水性聚合物衍
生物,它具有由下式(1)表示的环状亚苄基
缩醛连接体:
其中 R1 和 R6 各自独立地为氢原子或碳氢基团;R2、R3、R4 和 R5 各自独立地为取电子或供电子取代基或氢原子;X1 为
化学活性官能团;P 为亲
水性聚合物;s 为 1 或 2,t 为 0 或 1,s + t 为 1 或 2;w 为 1 至 8 的整数;Z1 和 Z2 各自独立地为选定的二价间隔物。