R. Troschutz et A. Karger, VERSATILE SYNTHESIS OF 6-SUBSTITUTED 8-DEAZAPTERIDINE-2,4-DIAMINES - FORMAL TOTAL SYNTHESIS OF 8,10-DIDEAZAMINOPTERIN, Journal of heterocyclic chemistry, 33(6), 1996, pp. 1815-1821
A new synthesis of 4-amino-4-deoxy-8,10-dideazapteroic acid (11d) and
6-substituted and 5,6-anellated 8-deazapteridine-2,4-diamines, 10a, 10
d, 25, is described. Starting from keteneaminals 1 or 12 and enaminone
s 4 or beta-aminoketone 17 the title compounds can be prepared via fun
ctional group transformation of 2-amino-3-nitropyridines 5 or nicotina
te 13a yielding 3-amino-alpha-picolinonitriles 9 which are cycloconden
sed with guanidine.