| 摘要 |
<p>Prodrugs and pharmaceutically acceptable salts thereof are provided carrying functional groups sensitive to mild bases and capable of slowly hydrolyzing to the original active drug molecule under physiological conditions. The prodrugs are preferably of the formula X - Y wherein Y is a moiety of a drug bearing at least one functional group selected from free amino, carboxyl, hydroxyl and/or mercapto, and X is a radical selected from radicals of formulas (i) to (iv) wherein R1 and R2, the same or different, are each hydrogen, alkyl, alkoxy, alkoxyalkyl, aryl, alkaryl, aralkyl, halogen, nitro, sulfo, amino, ammonium, carboxyl, PO3H2, or OPO3H2; R3 and R4, the same or different, are each hydrogen, alkyl or aryl; and A is a covalent bond when the radical is linked to a carboxyl or mercapto group of the drug Y, or A is OCO- when the radical is linked to an amino or hydroxyl group of Y, and pharmaceutically acceptable salts thereof. Examples of such prodrugs are those wherein Y is a moiety of insulin, human or bovine growth hormone, antibiotics, propanolol and others.</p> |
