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Prenylation of 3 4 di methoxy coumarins synthesis of 2 2 di methyl chromeno pyrans



Prenylation of 3 4 di methoxy coumarins synthesis of 2 2 di methyl chromeno pyrans



Indian Journal of Chemistry Section B Organic Chemistry Including Medicinal Chemistry 16(11): 1033-1034



Prenylation of 7-hydroxy-3,4-dimethoxy-, 7-hydroxy-3,4,5-trimethoxy- and 5-hydroxy-3,4,7-trimethoxycoumarins with 3-chloro-3-methylbut-1-yne in acetone in the presence of potassium carbonate and potassium iodide furnishes the corresponding propargyl ethers on refluxing with dimethylaniline give the corresponding dimethylchromenopyrans. These chromenopyrans could also be obtained in 1 step by refluxing the above hydroxycoumarins with 3-chloro-3-methylbut-1-yne in dioxane in the presence of potassium carbonate and potassium iodide.

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