Racemisation of quaternary chiral centers

C - Chemistry – Metallurgy – 07 – D

Patent

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Details

C07D 211/88 (2006.01) C07B 55/00 (2006.01) C07C 253/30 (2006.01) C07C 255/37 (2006.01)

Patent

CA 2242572

A process for the racemisation of an enantiomerically-enriched compound of the formula (3): X-(Ar)(Ak)C-(CH2)2-Y, comprises treatment of enantiomerically- enriched (3) with a base to obtain anion (4), optionally in protonated form, which is then combined with CH2=CH-Y1 to form racemic (3), wherein Ar = aryl or heteroaryl; Ak = C1-20 alkyl; X = CN, CO2R, CONR1R2, COR; Y and Y1 are independently selected from CN, CO2R, CONR1R2 and COR; and R, R1 and R2 are independently selected from H and C1-20 alkyl; optionally as a salt thereof. This racemisation process can be used as part of an efficient synthesis of enantiomerically-enriched verapamil or aminoglutethimide.

L'invention concerne un procédé de racémisation d'un composé enrichi de manière énantiomère de la formule (3): X-(Ar)(Ak)C-(CH¿2?)¿2?-Y comprenant le traitement du composé enrichi de manière énantiomère (3) avec une base afin d'obtenir un anion (4), éventuellement sous forme protonée, qui est ensuite combiné à CH¿2?=CH-Y?1¿ afin d'obtenir un racémique (3); dans lesdites formules Ar = aryle ou hétéroaryle, Ak = alkyle C¿1-20?, X = CN, CO¿2?R, CONR?1¿R?2¿, COR, Y et Y?1¿ sont sélectionnés indépendemment parmi CN, CO¿2?R, CONR?1¿R?2¿ et COR, et R, R¿1? et R¿2? sont sélectionnés indépendemment entre H et alkyle C¿1-20?; éventuellement sous forme d'un sel de ce composé. Ce procédé de racémisation peut être utilisé comme étape d'une synthèse efficace de vérapamil ou d'aminoglutéthimide enrichis de manière énantiomère.

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