NEW PROCESS FOR PREPARING 3-METHYL-4-PHENYLISOXAZOLOÝ3,4-D¨PYRIDAZIN-7(6H)-ONE
申请人:Almirall, S.A.
公开号:EP2125830A1
公开(公告)日:2009-12-02
NEW PROCESS FOR PREPARING 3-METHYL-4-PHENYLISOXAZOLO[3,4-D]PYRIDAZIN-7(6H)-ONE
申请人:Almirall, S.A.
公开号:EP2125830B1
公开(公告)日:2011-01-26
PROCESS FOR PREPARING 3-METHYL-4-PHENYLISOXAZOLO [3,4-D]PYRIDAZIN-7(6H)-ONE
申请人:Marchueta Hereu Iolanda
公开号:US20100137591A1
公开(公告)日:2010-06-03
A process for preparing 3-methyl-4-phenylisoxazolo[3,4-d]pyridazin-7(6H)-one which process comprises the steps of: (a) reacting 1-phenylbutane-1,3-dione with ethyl 2-chloro-2-(hydroxyimino)actetate; and (b) subsequently reacting the product from step (a) with hydrazine or an hydrate thereof to yield 3-methyl-4-phenylisoxazolo-[3,4-d]pyridin-7(6H)-one, wherein step (b) is carried out on the mixture resulting from step (a) without isolating ethyl 4-benzoyl-5-methylisoxazole-3-carboxylate therefrom.
[EN] NEW PROCESS FOR PREPARING 3-METHYL-4-PHENYLISOXAZOLO[3,4-D]PYRIDAZIN-7(6H)-ONE<br/>[FR] NOUVEAU PROCÉDÉ DE PRÉPARATION DE 3-MÉTHYL-4-PHÉNYLISOXAZOLO[3,4-D]PYRIDAZIN-7(6H)-UN
申请人:ALMIRALL LAB
公开号:WO2008107064A1
公开(公告)日:2008-09-12
[EN] A process for preparing 3-methyl-4-phenylisoxazolo[3,4-d]pyridazin-7(6H)-one which process comprises the steps of: a) reacting 1 -phenylbutane-1,3-dione with ethyl 2-chloro-2-(hydroxyimino)acetate, b) subsequently reacting the product from step (a) with hydrazine or an hydrate thereof to yield 3-methyl-4-phenylisoxazolo[3,4-d]pyridazin-7(6H)-one, wherein step (b) is carried out on the mixture resulting from step (a) without isolating ethyl 4-benzoyl-5-methylisoxazole-3-carboxylate there from. [FR] La présente invention concerne un procédé de préparation de 3-méthyl-4-phénylisoxazolo[3,4-d]pyridazin-7(6H)-un qui se compose des étapes suivantes : a) la réaction de 1 -phénylbutane-1,3-dione avec de l'éthyle 2-chloro-2-(hydroxyimino)acétate, b) la réaction suivante du produit de l'étape (a) avec de l'hydrazine ou un hydrate dérivé pour produire du 3-méthyl-4-phénylisoxazolo[3,4-d]pyridazine-7(6H)-un. L'étape (b) est réalisée sur le mélange résultant de l'étape (a) sans isoler l'éthyle 4-benzoyl-5-méthylisoxazole-3-carboxylate.
Dal Piaz,V.; Renzi,G., Gazzetta Chimica Italiana, 1968, vol. 98, p. 667 - 680