The assembly of β-methylene-TAD, a metabolically stable analogue of the antitumor agent tad, by the stepwise esterification of monodeprotected methylenebis-(phosphonate) benzyl esters under mitsunobu conditions

Synthesis of the metabolically stable analogue of thiazole-4-carboxamide ademine dinucleotide (β-methylene-TAD) was achieved via the sequential monodeprotection of tetrabenzyl methylenebis(phosphonate) after two rounds of Mitsunobu esterifications with the corresponding nucleoside components, tiazofurin and adenosine.