Regiospecific reduction of the 2-carbonyl group of the 6-hydroxypyrimido[2,1-f]purine-2,4,8(1H,3H,9H)-trione system by selected metal hydrides. A novel reduction of a fused xanthine nucleus
(EN) Substituted 2,3-dihydro-6-hydroxy-pyrimido-(2,1-f)-purine-4,8,(1H,9H)-diones, having the formula (I) are anti-inflammatory and anti-allergy agents. Methods for their preparation and use are described.(FR) Des 2,3-dihydro-6-hydroxy-pyrimido-(2,1-f)-purine-4,8(1H, 9H)-diones substituées ayant la formule (I), constituent des agents anti-inflammatoires et anti-allergiques. L'invention concerne leurs procédés de préparation et d'utilisation.