Chemistry of Heterocyclic Compounds p. 264 - 265 (1990)
Update date:2022-08-28
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Pozdnev, V. F.
A new variant of the synthesis of 7-amino-4-methylcoumarin from m-aminophenol via a three-step scheme is proposed.Acylation of m-aminophenol with methoxycarbonyl chloride gave m-(N-methoxycarbonylamino)phenol, which was converted to 7-(N-methoxycarbonylamino)-4-methylcoumarin by condensation with acetoacetic ester in sulfuric acid.Heating of the coumarin with concentrated alkali leads to an intermediate, which, after acidification, is converted to 7-amino-4-methylcoumarin in high yield.
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