PHOSPHONATED ISOXAZOLIDINYL NUCLEOSIDES, A NEW CLASS OF MODIFIED NUCLEOSIDES.

This review offers an overview of the synthesis of phosphonated isoxazolidinyl nucleosides, a new class of interesting and potentially antiviral/antitumor agents. The synthetic methodology relies on a 1,3-dipolar cycloaddition reaction as a key step. The cycloaddition process involves substituted nitrones, phosphonated nitrones, or nitrones containing functional groups easily convertible into a phosphonated group. Biological assays are presented, which show that phosphonated isoxazolidinyl nucleosides represent a new promising template of nucleoside analogues. [ABSTRACT FROM AUTHOR]