Synthesis of nucleoside–amino acid conjugates containing boranephosphate, boranephosphorothioate and boranephosphoramidate linkages
摘要:
Conjugates of 3'-azido-2',3'-dideoxythymidine (AZT) and 2',3'-didehydro-2',3'-dideoxythymidine (D4T) with the hydroxyl group of tyrosine containing boranephosphate and boranephosphorothioate moieties were prepared via the oxathiaphospholane and dithiaphospholane methodology as a mixture of P-diastereomers. Their structures were confirmed by MS analysis and H-1, P-31 NMR spectroscopy. It has been shown that the boranephosphorothioate linkage is unstable under acidic conditions. The first nucleoside-alanine conjugates connected through a boranephosphoramidate linkage were also obtained. (C) 2003 Elsevier Ltd. All rights reserved.