Abstract: A compound of the following formula (I) or a pharmaceutically acceptable salt thereof, wherein R1 and R2 are independently H; R3 is selected from H, a C1-C7 straight-chain, and a branched or cyclic alkyl; and R4, R5, R6, R7, and R8 are each independently selected from C1-C7 alkyl, halo C1-C7 alkyl and the like. Also provided is a method for preparing the compound, pharmaceutical compositions including the compound or pharmaceutically acceptable salts thereof, and uses of the compound or pharmaceutically acceptable salt thereof in the preparation of a medicine for inhibiting HIF prolyl hydroxylase or a medicine for promoting the generation of endogenous EPO.

Abstract: A compound of 5-hydroxyl-1,7-naphthyridine substituted by aryloxy or heteroaryloxy, a preparation method thereof and a pharmaceutical use thereof are provided. In particular, the compound has the following Formula (I), wherein R2 and R3 are each independently H; R1 is H or C1-C3 alkyl; Ar is an aromatic ring or a heteroaromatic ring selected from a naphthalene ring, a pyridine ring, a thiophene ring, a furan ring and a substituted benzene ring. Pharmaceutically acceptable salts of the present compound, are provided, as well as uses of the compound or pharmaceutically acceptable salts thereof in the preparation of a medicine for inhibiting HIF prolyl hydroxylase or a medicine for promoting the generation of endogenous EPO.

Abstract: Disclosed are a compound of the following formula (I) or a pharmaceutically acceptable salt thereof, a preparation method thereof, pharmaceutical compositions and uses thereof in the preparation of a medicine for inhibiting HIF prolyl hydroxylase or a medicine for promoting the generation of endogenous EPO, wherein in the formula (I), R1 and R2 are each independently hydrogen; R3 is hydrogen or C1-3 alkyl; and Ar is an aromatic ring or an heteroaromatic ring selected from a naphthalene ring, a pyridine ring, a thiophene ring, a furan ring and a substituted benzene ring.