Exploring synthetic routes to nucleoside alkynylphosphonates.

Alkynylphosphonates belong to a very interesting family as they may be viewed as precursors to a wide range of functionalized derivatives. Considering our ongoing research on 5'-mononucleotides of biological interest, we embarked on the synthesis of such compounds. Despite a limited number of steps, the nucleosidic pathway appeared disappointing. Therefore, an osidic pathway was explored and proved to be interesting. The corresponding optimization study and the synthesis of a new series of nucleoside alkynylphosphonates are described herein.