NEW HETEROCYCLIC COMPOUND

摘要

PROBLEM TO BE SOLVED: To obtain a new compound having a fluorescent characteristic, having good heat stability and light resistance and useful as a pigment capable of being easily dissolved in polymers. SOLUTION: A compound of formula I [R1, R2 are each CH3, a CH2(1-4C alkyl) or the like; R3 is H, a 1-6C alkyl or a 3-10C alkenyl; R4 is a direct bond or a cross-linking bond; R5 is H or a 1-4C alkyl; R6-R9 are each H, a halogen or the like; X is S, O or the like; (n) is 1-4], a compound of formula II. The compound of formula I is obtained by condensing one of a dicarboxylic acid of formula III and its functional derivatives with an amine of formula IV or its salt in a melt in the absence of a solvent at a temperature of e.g. 150-300 deg.C or in an inert solvent such as dimethylacetamide at a temperature of 25-300 deg.C in the presence or absence of a catalyst such as toluene sulfonic acid at an atmospheric pressure or at an elevated pressure.