Abstract
Syntheses of Aminolumazines 6-aminolumazien 2 (1-(6-amino-2,4,7-trioxo-1,2,3,4,7,8-hexahydropteridin-8-yl)-1-deoxy-D-ribitol), a degradation product of russupteridine-yellow I (1) has been prepared from l-deoxy-l-(2,4,7-trioxo-1,2,3,4,7,8-hexahydeopteridin-8-yl)-D-ribitol (5) via the azo compound 6 and its reduction with Sn/HCOOH. Condensation of 5-amono-6-(D-ribitylamino)uracil (8) with parabanic acid (9) has led to ta synthesis of russupteridine-yellow IV (4); l-deoxy-l-(2,6,8-trioxo-2,4,5,6,7,8-hexahydro-lH-imidazolo[4,5-g]pteridin-4-yl-D-ribitol), albeit in low yield.
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