Synthesis of carbamate derivatives of coumarin and chromene |
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Authors: | A V Velikorodov N M Imasheva |
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Institution: | (1) Astrakhan State University, ul. Tatishcheva 20a, Astrakhan, 414056, Russia |
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Abstract: | Condensation of methyl (3-hydroxyphenyl)carbamate with ethyl acetoacetate and ethyl benzoylacetate at room temperature, as well as with L-2-hydroxysuccinic acid on heating, in the presence of concentrated sulfuric acid gave the corresponding methyl (4-R-2-oxo-2H-chromen-7-yl)carbamates (R = Me, Ph, H). Condensation of methyl (3-hydroxyphenyl)carbamate with benzylidenemalononitrile or with aromatic aldehydes and malononitrile on heating in propan-2-ol in the presence of piperidine led to the formation of the corresponding methyl (4-aryl-2-amino-3-cyano-4H-chromen-7-yl)carbamates. |
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