| 摘要 |
<p>PURPOSE:To provide a new 2,3-dicyanobezofuro[2,3-b]pyrazine derivative having strong fluorescent characteristics, excellent in shielding power and durability, and useful for fluorescent coatings, etc., by subjecting a dihalogenodicyanopyrazine and a phenol derivative to a thermal cyclization reaction in the presence of an alkali an acid. CONSTITUTION:The new 2,3-dicyanobenzofuro[2.3-b]pyrazine derivative of formula I (Y, Z are H, lower alkyl, lower alkoxy, di-lower alkylamino wherein at least one of Y and Z is di-lower alkylamino) exhibiting strong fluorescent characteristics, excellent in shielding power and durability, and useful for fluorescent coatings, inks, etc. The compound is obtained by subjecting a 2,3- dihalogeno-5,6-dicyanopyrazine of formula II (X is halogen) and a phenol derivative of formula III (R is H, a hydroxyl group-protecting group; A, B are H, lower alkyl, lower alkoxy, di-lower alkylamino) to a thermal, alkaline or acidic cyclization reaction in the presence of a solvent.</p> |
