Improved process for the preparation of 9,11 epoxy steroids

C - Chemistry – Metallurgy – 07 – J

Patent

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C07J 71/00 (2006.01)

Patent

CA 2560389

Processes are described for epoxidation reactions. In particular, the process comprises the conversion of a steroid substrate having an olefinic unsaturation in the steroid nucleus to a structure comprising a 9,11-epoxy substituent by reaction of the substrate with a peroxide compound in the presence of a peroxide activator. The epoxidation processes described are conducted at relatively low hydrogen peroxide to steroid substrate ratio. Several optional process modifications are described.

Cette invention concerne des procédés permettant de réaliser des réactions d'époxydation. Un procédé de cette invention comprend en particulier la conversion d'un substrat stéroïde présentant une insaturation oléfinique dans le noyau stéroïde en une structure comprenant un substituant 9,11-époxy au moyen de la réaction du substrat avec un composé peroxyde en présence d'un activateur de peroxyde. Les procédés d'époxydation décrits dans la présente invention sont mis en oeuvre avec un rapport peroxyde d'hydrogène sur substrat stéroïde relativement faible. Cette invention concerne également plusieurs modifications facultatives pouvant être apportées au procédé.

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