535921-06-3

Upstream product

• 7644-04-4 4-bromophenacylamine 
• 535921-01-8 4-methoxy-3-benzoylcoumarin 
• 16709-58-3 2-oxo-2H-chromen-4-yl benzoate 
• 98-88-4 benzoyl chloride 
• 1076-38-6 4-hydroxy[1]benzopyran-2-one 
• 19492-11-6 3-benzoyl-4-hydroxy-2H-chromen-2-one 

Downstream Products

• 535921-11-0 2-(4-bromo-benzoyl)-3-phenyl-1H-5-oxa-1-aza-cyclopenta[a]naphthalen-4-one 

Relevant academic research and scientific papers

Efficient synthesis of trisubstituted [1]benzopyrano[4,3-b]pyrrol-4(1H)-one derivatives from 4-hydroxycoumarin

Various trisubstituted [1]benzopyrano[4,3-b]pyrrol-4(1H)-one derivatives have been synthesized from 4-hydroxycoumarin with a 30-40% yield over six steps. The key step of the synthesis is a base-promoted intramolecular cyclization of enamines 5, followed by dehydration to generate the fused pyrrole ring.