98078-83-2

Upstream product

• 102964-56-7 4--2-(2-hydroxyphenyl)-4H-1,3-benzoxazine 
• 98078-82-1 2-(2-Hydroxyphenyl)-5-imino-4-thioxo-3,4-dihydro-5H-<1>benzopyrano<4,3-d>pyrimidine 
• 105950-27-4 2-(2-Hydroxyphenyl)-5-imino-4-methylthio-5H-<1>benzopyrano<4,3-d>pyrimidine 
• 98078-84-3 2-(2-Hydroxyphenyl)-5-oxo-4-thioxo-3,4-dihydro-5H-<1>benzopyrano<4,3-d>pyrimidine 
• 90681-65-5 4-Dicyanomethylene-2-(2-hydroxyphenyl)-4H-1,3-benzoxazine 
• 105950-28-5 2-(2-Hydroxyphenyl)-4-methylthio-5-oxo-5H-<1>benzopyrano<4,3-d>pyrimidine 
• 98078-81-0 2-(2-Hydroxyphenyl)-5-imino-4-oxo-3,4-dihydro-5H-<1>benzopyrano<4,3-d>pyrimidine 

Relevant academic research and scientific papers

Eine einfache Synthese von 5H-Benzopyranopyrimidin-Derivaten mit Oxo-, Thioxo- und/oder Imino-Funktionen in 4- und 5-Stellung

The reaction of 4-dicyanomethylene- or 4--2-(2-hydroxyphenyl)-4H-1,3-benzoxazine with ammonium acetate, hydrogen sulfide, or aqueous acid represents a useful method for the preparation of 4,5-(imino, thioxo, or oxo)-disubstituted 2-(2-hydroxyphenyl)-3,4-dihydro-5H-benzopyranopyrimidines.