Nouvelles amides de la série du pyran et procédés de préparation de celles-ci
The invention comprises amides of the formula (wherein R1 is an alkyl or aryl group and R2 is hydrogen, or R1 and R2 are joined to form a fused benzene ring which may be substituted by one or more halogen atoms or hydroxy or alkyl groups, R3 is an alkyl or alkenyl radical of at most 12 carbon atoms...
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Zusammenfassung: | The invention comprises amides of the formula (wherein R1 is an alkyl or aryl group and R2 is hydrogen, or R1 and R2 are joined to form a fused benzene ring which may be substituted by one or more halogen atoms or hydroxy or alkyl groups, R3 is an alkyl or alkenyl radical of at most 12 carbon atoms, an aralkyl group, an aryl group substituted by one or more halogen atoms or hydroxy or acyloxy groups, or a pyridyl group, and R4 is hydrogen, or R3 and R4 are joined to form together with the adjacent nitrogen atom a piperidino, 1-pyrrolidinyl or morpholino group) and, their preparation by (1) heating a corresponding alkyl ester with the appropriate amine NHR3R4; or (2) when R4 is hydrogen, heating a corresponding 3-unsubstituted-4-hydroxy-a -pyrone with an appropriate isocyanate or azide R3NCO or R3CON3. n - Heptyl - isocyanate is prepared from n-heptylamine hydrochloride and phosgene. |
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