摘要:
We have developed a new approach to prodrugs, which utilizes a pH-induced intramolecular O --> N migration of an acyloxy group in carbonate moiety to a free amino moiety at neutral pH. This method is exemplified by facile rearrangement of highly water-soluble prodrug 3 to carbarnate 4, a close analogue of HIV-1 protease inhibitor Amprenavir. The O --> N acyloxy migration is unprecedented in the context of prodrugs and it enables a high atom economy due to recycling of the 'pro' moiety. (C) 2003 Elsevier Ltd. All rights reserved.