Pyridine coenzyme analogs. 3. Synthesis of three NAD+ analogs containing a 2'-deoxy-2'-substituted nicotinamide arabinofuranosyl moiety
摘要:
A general method for the preparation of 2'-deoxy-2'-substituted arabino-nicotinamide-adenine dinucleotide (NAD) analogues is described. Starting from 1,2:5,6-di-O-isopropylidine-alpha-D-allofuranose, the 2'-amino-, 2'-azido-, and 2'-fluoro-arabino-NAD analogues have been prepared. We report an improved phosphorylation procedure for nicotinamide nucleosides using pyrophosphoryl chloride in m-cresol. The selective reduction of azido substituents by aqueous dithiothreitol (DTT) in the presence of the readily reducible nicotinamide moiety is also reported. With both the 2'-azido and the 2'-fluoro substituents the cis configuration predominates for the incoming nicotinamide, thus allowing the stereoselective formation of the beta anomer in high yield.