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Synthesis, NMR Characterization and Crystal Structure of Methyl 3α,7α-Dihydroxy-12-oxo-5β-cholanate

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Abstract

The crystal structure and NMR characterization of methyl 3α,7α-dihydroxy-12-oxo-5β-cholanate are described. The title compound which was obtained from methyl cholanate in a 3-step synthetic sequence that does not alter the starting chirality, crystallizes in the monoclinic system with P 21 space group. While despite the substitution pattern rings A, B and C adopt chair conformations, the 5 membered D ring, that bears the side chain attached to C-17, shows a twisted conformation on C-13–C-14. In the crystal array, classical hydrogen bond interactions O–H···H and intermolecular contacts C–H···O of hydrogen bond type are observed.

Graphical Abstract

The crystal structure and NMR characterization of Methyl α,7α-dihydroxy-12-oxo-5β-cholanate are described.

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Acknowledgments

The authors acknowledge the financial support provided by Dirección General de Asuntos del Personal Académico (Project DGAPA-IN211714) and the Faculty of Chemistry (PAPIIT-5000-9063). Thanks are due to Rosa I. del Villar Morales (USAI-UNAM) for recording NMR spectra and to Dr. Carlos Cobas from Mestrelab® for assistance with the MestreNova NMR processing program.

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Correspondence to Martín A. Iglesias Arteaga.

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Tinajero-Delgado, V., Romero-Ávila, M., Flores-Álamo, M. et al. Synthesis, NMR Characterization and Crystal Structure of Methyl 3α,7α-Dihydroxy-12-oxo-5β-cholanate. J Chem Crystallogr 44, 487–492 (2014). https://doi.org/10.1007/s10870-014-0543-1

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  • DOI: https://doi.org/10.1007/s10870-014-0543-1

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