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Takeda Pharmaceutical Co Ltd
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Takeda Chemical Industries Ltd
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Publication date
Application filed by Takeda Chemical Industries LtdfiledCriticalTakeda Chemical Industries Ltd
Priority to JP9270976ApriorityCriticalpatent/JPS5318572A/en
Publication of JPS5318572ApublicationCriticalpatent/JPS5318572A/en
PURPOSE: To prepare chromone derivatives, useful as antiallergics, by the dealkoxycarbonylation of benzoylacetic acid ester tetrazole derivatives, followed by the acid treatment and the reaction with formic acid derivatives.
COPYRIGHT: (C)1978,JPO&Japio
JP9270976A1976-08-021976-08-02Preparation of chromone derivatives
PendingJPS5318572A
(en)