756525-83-4

Upstream product

• 106921-04-4 11-methyl-4-hydroxy-6,7,8,9-tetrahydrobenzofuro<3,2-g>benzopyran-2(H)-one 
• 62-53-3 aniline 
• 10139-84-1 1-(2,4-dihydroxy-3-methylphenyl)ethanone 
• 106921-01-1 7-acetyl-2,3,4,5-tetrahydro-8-hydroxy-9-methyldibenzofuran <6> 
• 116719-55-2 2-hydroxy-4-(2'-oxo-cyclohexyloxy)-3-methylacetophenone 
• 1056477-06-5 2-bromocyclohexanone 

Relevant academic research and scientific papers

Synthesis of benzofuro-4-anilino-2H-1-benzopyran-2-one and benzofuro-pyrano -2H-1-benzopyran-2-one

The title compounds are synthesized from the corresponding 4-hydroxy-benzopyran-2[H]-ones 5a,b .2, 4-Dihydroxy-acetophenone 1a,b on condensation with 2-bromocyclohexanone, followed by linear cyclisation and then on reaction with diethyl carbonate in presence of pulverised sodium gives 6, 7, 8, 9-tetrahydro-4-hydroxy-benzofuro [3, 2-g]-2H-1-benzopyran-2-one 5a,b, which on reaction with aniline, followed by dehydrogenation with palladised charcoal gives benzofuro[3, 2-g]-4-anilino-2H-1-benzopyran-2-one 7a,b. 5a,b on condensation with benzalacetone followed by dehydrogenation with palladised charcoal furnishes 2-methyl-4-phenyl-4-hydro-pyrano[3, 2-c]-benzofuro[3, 2-g]-SH-benzopyran-5-one 9a,b.