Process for producing aminobenzopyran compound

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 311/58 (2006.01) C07D 311/70 (2006.01)

Patent

CA 2496847

There is provided a method for producing aminobenzopyran compound, which results in little wastes, has no influence on reactors and necessitates a simple work- up procedure. Concretely, it is a method for producing aminobenzopyran compound of formula (2) (see formula 2) characterized by reducing a nitro group on 2,2-dimethyl 2H-1-benzopyran compound of formula (1) (see formula 1) with hydrazine in the presence of a metal catalyst.

L'invention concerne un procédé permettant de préparer un composé aminobenzopyrane et qui produit une quantité réduite de déchets, ne produit pas d'effet sur le réacteur et ne requiert qu'un post-traitement simple. Ce procédé permet de produire le composé aminobenzopyrane représenté par la formule (2), (2) et il est caractérisé par une étape consistant à réduire le groupe nitro d'un 2,2-diméthyl-2H-1-benzopyrane représenté par la formule (1), (1) avec de l'hydrazine, en présence d'un catalyseur métallique.

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