Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Takeda Pharmaceutical Co Ltd
Original Assignee
Takeda Chemical Industries Ltd
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Filing date
Publication date
Application filed by Takeda Chemical Industries LtdfiledCriticalTakeda Chemical Industries Ltd
Priority to JP6700778ApriorityCriticalpatent/JPS54160381A/en
Publication of JPS54160381ApublicationCriticalpatent/JPS54160381A/en
NEW MATERIAL:3-(Tetrazolyl-5-yl)-coumarim of formula I and its salt.
USE: Antiallergic drugs effective for allergic asthma and dermatitis, and hay fever.
PROCESS: A compound of formula II: (R is H, alkyl, or aralkyl group) is reacted with salicylaldehyde in the presence of a base, or a compound of formula III is reacted with hydrazoic acid or its salt to give the objective compound of formula I.