Synthesis of dibenzopyranones and pyrazolobenzopyranones through copper(0)/Selectfluor system-catalyzed double C[sbnd]H activation/oxygen insertion of 2-arylbenzaldehydes and 5-arylpyrazole-4-carbaldehydes
A mild and efficient protocol for the synthesis of dibenzopyranones and pyrazolobenzopyranones was developed involving a copper(0)/Selectfluor system-catalyzed double C[sbnd]H activation/oxygen insertion of 2-arylbenzaldehydes and 5-arylpyrazole-4-carbaldehydes. Preliminary mechanistic studies suggest that both water and dioxygen act as the oxygen source in the formation of pyranone scaffolds.
REGIOCHEMISTRY OF THE CYCLOADDITIONS OF DIPHENYLNITRILIMINE TO COUMARIN, 3-ETHOXYCARBONYL AND 3-ACETYL COUMARINS. A REINVESTIGATION
The cycloaddition reactions of diphenylnitrilimine to coumarin, 3-ethoxycarbonyl and 3-acetylcoumarins were studied.The observed regiochemistry of the reaction with the coumarin 4a was the same as the one suggested by other researchers.For the coumarins 4
Fathi, Toufik,Dinh An, Nguyen,Schmitt, Gerard,Cerutti, Ernest,Laude, Bernard
p. 4527 - 4536
(2007/10/02)
Cycloaddition of diphenylnitrilimine to coumarins. The synthesis of 3a,9b-dihydro-4-oxo-1h-benzopyrano [4,3-c]pyrazole derivatives
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Shawali,Elanadouli,Albar
p. 1877 - 1884
(2007/10/02)
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