Reversible pegylated drugs are provided by derivatization of free functional groups of the drug selected from amino, hydroxyl, mercapto, phosphate and/or carboxyl with groups sensitive to mild basic conditions such as 9-fluorenylmethoxycarbonyl (Fmoc) or 2-sulfo-9-fluorenylmethoxycarbonyl (FMS), to which group a PEG moiety is attached. In these pegylated drugs, the PEG moiety and the drug residue are not linked directly to each other, but rather both residues are linked to different positions of the scaffold Fmoc or FMS structure that is highly sensitive to bases and is removable under physiological conditions. The drugs are preferably drugs containing an amino group, most preferably peptides and proteins of low or medium molecular weight. Similar molecules are provided wherein a protein carrier or another polymer carrier replaces the PEG moiety.
可逆的聚
乙二醇化药物是通过对所选药物的游离功能基团(包括
氨基,羟基,巯基,
磷酸酯和/或羧基)进行衍生化,使用对轻微碱性条件敏感的基团(如9-
芴甲氧羰基(
FMoc)或2-
磺酸基-9-
芴甲氧羰基(
FMS)),然后将P
EG基团附着在该基团上。在这些聚
乙二醇化药物中,P
EG基团和药物残基不直接链接在一起,而是两个残基链接到高度敏感于碱性且可在生理条件下去除的
FMoc或
FMS结构的不同位置。这些药物最好是含有
氨基基团的药物,特别是低分子量或中分子量的肽和蛋白质。类似的分子也可用蛋白质载体或其他聚合物载体代替P
EG基团。