METHOD OF PREPARING 1-/2-B-NAPHTHYLOXY-ETHYL/-3-METHYL-PIPERAZOLONE-(5)

摘要

1454733 1 - (2 - Beta - naphthoxyethyl)- 3 - methylpyrazolin - 5 - one BAYER AG 6 May 1975 [6 June 1974 11 July 1974] 18970/75 Heading C2C The invention comprises the title compound and its salts. In examples, it is prepared by reacting (1) 2-beta-naphthoxyethylhydrazine with an alkyl or benzyl acetoacetate or tetrolate, or (2) a 2-beta-naphthoxyethyl halide with 3-methylpyrazolin-5-one or its sodium derivative. Therapeutic compositions having antithrombotic and thrombolytic activity comprise the above compound or its salts, and may be administered orally, parenterally or rectally.