▎ 摘　　要

NOVELTY - Preparing 3-substituted 4-hydroxycoumarin compound (I) involves mixing 4-hydroxycoumarin derivatives (II) with unsaturated alpha - beta -ketone (III); adding water; adding amino functional solid catalyst; heating reaction mixture at temperature of about 80-120 degrees C for defined duration to get viscous mass; crystallizing viscous mass using organic solvent to provide purified 3-substituted 4-hydroxycoumarin compound (I). USE - Process for preparing 3-substituted 4-hydroxycoumarin compound of formula (I). ADVANTAGE - The process for preparing 3-substituted 4-hydroxycoumarin compound of formula (I) enables to avoid usage of toxic, organic solvent; is safe for environment and compounds produced, in particular pharmaceutical compounds safe for human administration; avoid multiple steps, and times to render process efficient and catalyst reused by making process economical. DETAILED DESCRIPTION - Preparing 3-substituted 4-hydroxycoumarin compound of formula (I) involves mixing 4-hydroxycoumarin derivatives of formula (II) with unsaturated alpha - beta -ketone of formula (III); adding water; adding amino functional solid catalyst; heating reaction mixture at temperature of about 80-120 degrees C for defined duration to get viscous mass; crystallizing viscous mass using organic solvent to provide purified 3-substituted 4-hydroxycoumarin compound of formula (I).. For 3-substituted 4-hydroxycoumarin compound of formula (I): X=oxygen (O), or sulfur (S); and R1=alkyl group, substituted alkyl group, phenyl group, substituted phenyl group, naphthyl group, and substituted naphthyl group. For 4-hydroxycoumarin derivatives of formula (II):X=O, or S. For alpha - beta -ketone of formula (III): R, R'=alkyl group, substituted alkyl group, phenyl group, substituted phenyl group, naphthyl group, and substituted naphthyl group.