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Individual
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Individual
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Priority to JP8674678ApriorityCriticalpatent/JPS5515407A/en
Publication of JPS5515407ApublicationCriticalpatent/JPS5515407A/en
USE: Drugs for arteriosclerosis, anti-thrombotics, or thromboxane A2 antagonistic drugs. An intermediate for 7-ethoxycarbonyl-6,8-dimethyl-4-(β,β-diacetylvinyl)-2- phenyl-1-phthalazone and its derivatives (the same drugs as described above).
PROCESS: A compound of formula II is oxidized with chromic acid or its salt to give the objective compound of formula I.