20280-94-8

Upstream product

• 718-08-1 ethyl 3-oxo-4-phenylbutyrate 
• 7664-93-9 sulfuric acid 
• 108-46-3 recorcinol 
• 91962-64-0 ethyl 4-phenylbuta-2,3-dienoate 
• 412019-21-7 ethyl 2-acetyl-3-oxo-4-phenylbutanoate 
• 20320-59-6 diethyl 2-(2-phenylacetyl)malonate 

Downstream Products

• 1270046-66-6 4-benzyl-7-(3,4-difluorophenoxy)-2H-chromen-2-one 
• 1270046-32-6 4-[1H-imidazol-1-yl(phenyl)methyl]-7-methoxy-2H-chromen-2-one 
• 1270046-34-8 7-(3,4-difluorophenoxy)-4-[1H-imidazol-1-yl(phenyl)methyl]-2H-chromen-2-one 
• 1270046-67-7 4-[bromo(phenyl)methyl]-7-(3,4-difluorophenoxy)-2H-chromen-2-one 
• 118067-19-9 4-Benzoyl-7-methoxy-chromen-2-one 
• 118070-20-5 4-benzyl-7-methoxy-2H-chromen-2-one 

Relevant academic research and scientific papers

Synthesis of substituted coumarins via Bronsted acid mediated condensation of allenes with substituted phenols or anisoles

Coumarins were obtained from the condensation of electron-rich arenes with allenes in the presence of TfOH in good yield. Depending on the substituent pattern of allenes employed, the general synthetic method of 4-substituted and 3,4-disubstituted 3-arylc