摘要:
Practical and convergent syntheses of 2'-deoxy-1',2'-seco-nucleophosphonates and 1',2'-seco-nucleophosphonates are described. Phosphonate chirons derived from D-isoascorbic acid were used in alkylation of functionalized nucleobases to provide the title phosphonate isosteres in good yields. Subsequent deprotection and deesterification led to the 5'-C-methylenephosphonic acids which were conveniently purified using gravity flow C-18 reverse phase column chromatography.