Chiral beta-nitro alcohols are key intermediates in the synthesis of a wide range of active pharmaceutical ingredients. Despite their massive use for pharmaceutical applications, in-depth kinetics studies concerning their stability during formation and transformation reactions are scarce in the literature. In this study, the (1R,2S)-1-(m-benzyloxy)-2-nitro-1-propanol) (BNA), the precursor of the metaraminol, was selected as a molecular model and the retro-Henry reaction was explored by a multidisciplinary approach involving HPLC, electronic circular dichroism and theoretical methods.The enantio-, diastereo-, and chemo-selective high-performance liquid chromatographic method for deter-mining the purity of beta-nitro alcohol during its formation and degradation is based on the use of an amylose-derived chiral stationary phase under normal-phase eluent conditions. The influence of various factors (e.g. temperature, type of reaction solvent, basic and acid catalysts) on the degradation kinetics has been investigated. The retro-Henry reaction was found to be the major degradation of BNA, under spontaneous, solvent-and base-catalyzed conditions, resulting in the formation of its precursors 3-benzyloxybenzaldehyde and nitroethane.

Kinetic and mechanism study of the spontaneous, solvent- and base-catalyzed degradation of the precursor of the β-nitro alcohol metaraminol by combining HPLC/electronic circular dichroism/theoretical methods / Cantatore, Chiara; Visconti, Paolo; Pierini, Marco; Cirilli, Roberto. - In: JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS. - ISSN 0731-7085. - 220:(2022). [10.1016/j.jpba.2022.114972]

Kinetic and mechanism study of the spontaneous, solvent- and base-catalyzed degradation of the precursor of the β-nitro alcohol metaraminol by combining HPLC/electronic circular dichroism/theoretical methods

Cantatore, Chiara;Visconti, Paolo;Pierini, Marco;
2022

Abstract

Chiral beta-nitro alcohols are key intermediates in the synthesis of a wide range of active pharmaceutical ingredients. Despite their massive use for pharmaceutical applications, in-depth kinetics studies concerning their stability during formation and transformation reactions are scarce in the literature. In this study, the (1R,2S)-1-(m-benzyloxy)-2-nitro-1-propanol) (BNA), the precursor of the metaraminol, was selected as a molecular model and the retro-Henry reaction was explored by a multidisciplinary approach involving HPLC, electronic circular dichroism and theoretical methods.The enantio-, diastereo-, and chemo-selective high-performance liquid chromatographic method for deter-mining the purity of beta-nitro alcohol during its formation and degradation is based on the use of an amylose-derived chiral stationary phase under normal-phase eluent conditions. The influence of various factors (e.g. temperature, type of reaction solvent, basic and acid catalysts) on the degradation kinetics has been investigated. The retro-Henry reaction was found to be the major degradation of BNA, under spontaneous, solvent-and base-catalyzed conditions, resulting in the formation of its precursors 3-benzyloxybenzaldehyde and nitroethane.
2022
Circular dichroism; Degradation kinetics; Enantio- and diastereo-selective HPLC; Metaraminol; Theoretical calculations; β-nitro alcohol
01 Pubblicazione su rivista::01a Articolo in rivista
Kinetic and mechanism study of the spontaneous, solvent- and base-catalyzed degradation of the precursor of the β-nitro alcohol metaraminol by combining HPLC/electronic circular dichroism/theoretical methods / Cantatore, Chiara; Visconti, Paolo; Pierini, Marco; Cirilli, Roberto. - In: JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS. - ISSN 0731-7085. - 220:(2022). [10.1016/j.jpba.2022.114972]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1706322
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