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Crystal structure of naltrexone chloride solvates with ethanol, propan-2-ol, and 2-methyl-propan-2-ol.


ABSTRACT: Naltrexone [systematic name: 17-(cyclo-propyl-meth-yl)-3,14-di-hydroxy-4,5?-epoxymorphinan-6-one] is an opioid receptor competitive antagonist that has been widely used to prevent relapse in opioid- and alcohol-dependent subjects. Its chloride salt forms non-isomorphic solvates with ethanol (C20H24NO4+·Cl-·C2H5OH) (I), propan-2-ol (C20H24NO4+·Cl-·C3H7OH) (II), and 2-methyl-propan-2-ol (C20H24NO4+·Cl-·C4H9OH) (III). The naltrexone cation can be described as a T-shape made out of two ring systems, a tetra-hydro-2H-naphtho-[1,8-bc]furan system and a deca-hydro-isoquinolinium subunit, that are nearly perpendicular to one another. The flexible cyclo-propyl-methyl group can adopt various different conformations in response to its surroundings: an increase of available space around cyclo-propyl-methyl group may allow it to adopt a more favorable conformation. In all these structures, the alcohol mol-ecules occupy infinite solvent-filled channels. All three compounds described are attractive crystalline forms for unambiguous identification of naltrexone chloride after isolation from a pharmaceutical form. Compound (III) was refined as a two-component twin.

SUBMITTER: Menze AR 

PROVIDER: S-EPMC5499280 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Crystal structure of naltrexone chloride solvates with ethanol, propan-2-ol, and 2-methyl-propan-2-ol.

Menze Aveary R AR   Sinnott Jefferson P JP   Nazarenko Alexander Y AY  

Acta crystallographica. Section E, Crystallographic communications 20170613 Pt 7


Naltrexone [systematic name: 17-(cyclo-propyl-meth-yl)-3,14-di-hydroxy-4,5α-epoxymorphinan-6-one] is an opioid receptor competitive antagonist that has been widely used to prevent relapse in opioid- and alcohol-dependent subjects. Its chloride salt forms non-isomorphic solvates with ethanol (C<sub>20</sub>H<sub>24</sub>NO<sub>4</sub><sup>+</sup>·Cl<sup>-</sup>·C<sub>2</sub>H<sub>5</sub>OH) (I), propan-2-ol (C<sub>20</sub>H<sub>24</sub>NO<sub>4</sub><sup>+</sup>·Cl<sup>-</sup>·C<sub>3</sub>H<sub>  ...[more]

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