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To improve the low water-solubility of HIV-1 protease inhibitors KNI-272, -279 and -727, we previously reported the water-soluble prodrugs of these inhibitors based on O-->N intramolecular acyl migration reaction. These prodrugs were rapidly converted to the corresponding parent drugs under physiological conditions. To understand the steric and electrostatic effects of O-acyl moiety on the migration rate, we examined several types of prodrug. A remarkably slow migration was observed in the benzoyl-type prodrugs, and Hammett plot of migration rate constants of p-substituted benzoyl-type prodrugs gave a linear free energy relationship. (C) 2003 Elsevier Ltd. All rights reserved.
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