Journal of Medicinal Chemistry p. 1855 - 1859 (1993)
Update date:2022-08-16
Topics:
Pankiewicz, Krzysztof W.
Zeidler, Joanna
Ciszewski, Lech A.
Bell, J. Ellis
Goldstein, Barry M.
et al.
Two isosteric analogues of nicotinamide adenine dinucleotide, C-NAD (11) and C-PAD (12), in which the nicotinamide riboside portion is replaced by a C-nucleoside, were synthesized from 5-(β-D-ribofuranosyl)nicotinamide (7) and 6-(β-D-ribofuranosyl)picolinamide (8), respectively.Nucleoside 7 was prepared from the 2,3-O-isopropylidene-5-O-(tetrahydropyranyl)-D-ribonolactone (13) and 3-cyano-5-lithiopyridine as reported earlier.Nucleoside 8 was obtained by conversion of the bromo function of the 6-(2,3:4,5-di-O-isopropylidene-D-altro-pentitol-1-yl)-2-bromopyridine (14)into a carboxamido group followed by mesylation of the anomeric hydroxyl group to give derivative 18.Treatment of 18 with CF3COOH/CHCl3 caused deisopropylidenation with simultaneous cyclization into the desired 6-(β-D-ribofuranosyl)picolinamide (8).NAD analogues, C-NAD (11) and C-PAD (12), were synthesized by imidazole-catalyzed coupling of the corresponding 5'-monophosphates of 7 and 8 with the adenosine-5'-monophosphate.Dinucleotide 11 was found to inhibit the proliferation of L1210 cells (IC50 = 7 μM) and to be a good competitive inhibitor of inosine monophosphate dehydrogenase (IMPDH, ID50 = 20 μM) as well as bovine glutamate dehydrogenase (GDH, Ki = 15 μM).Interestingly, C-NAD (11) caused extremely potent noncompetitive inhibition of horse liver alcohol dehydrogenase (ADH, Ki = 1.1 nM), whereas C-PAD (12) was found to be a much less potent competitive inhibitor (Ki = 20 μM) of ADH.
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