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Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates

[Image: see text] The key intermediate in the synthesis of dorzolamide, (4S,6S)-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-ol-7,7-dioxide, can be obtained in the diastereoisomerically pure form in two straightforward steps starting from diastereoisomeric mixtures of cis/trans-(6S)-6-methyl-5,6-d...

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Autores principales: Martinelli, Andrea, Volpicelli, Raffaella, Verzini, Massimo, Cotarca, Livius, Maini, Lucia, Pengo, Paolo, Pasquato, Lucia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10413462/
https://www.ncbi.nlm.nih.gov/pubmed/37576669
http://dx.doi.org/10.1021/acsomega.3c03959
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author Martinelli, Andrea
Volpicelli, Raffaella
Verzini, Massimo
Cotarca, Livius
Maini, Lucia
Pengo, Paolo
Pasquato, Lucia
author_facet Martinelli, Andrea
Volpicelli, Raffaella
Verzini, Massimo
Cotarca, Livius
Maini, Lucia
Pengo, Paolo
Pasquato, Lucia
author_sort Martinelli, Andrea
collection PubMed
description [Image: see text] The key intermediate in the synthesis of dorzolamide, (4S,6S)-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-ol-7,7-dioxide, can be obtained in the diastereoisomerically pure form in two straightforward steps starting from diastereoisomeric mixtures of cis/trans-(6S)-6-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-yl acetate, regardless of their ratio. The reaction of crucial importance in this scheme is a remarkably stereoselective solvolysis of the acetate ester in an acetone/phosphate buffer mixture as the solvent system. Investigation of this so far unrecognized stereoselective reaction reveals that it proceeds via an S(N)1-like pathway as indicated by the correlation of the solvolysis rate constants with the Y(OTs) values of different solvent mixtures and by trapping of the reaction intermediate with sodium azide. The structure of (4S,6S)-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-ol-7,7-dioxide was confirmed by single-crystal X-ray analysis.
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spelling pubmed-104134622023-08-11 Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates Martinelli, Andrea Volpicelli, Raffaella Verzini, Massimo Cotarca, Livius Maini, Lucia Pengo, Paolo Pasquato, Lucia ACS Omega [Image: see text] The key intermediate in the synthesis of dorzolamide, (4S,6S)-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-ol-7,7-dioxide, can be obtained in the diastereoisomerically pure form in two straightforward steps starting from diastereoisomeric mixtures of cis/trans-(6S)-6-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-yl acetate, regardless of their ratio. The reaction of crucial importance in this scheme is a remarkably stereoselective solvolysis of the acetate ester in an acetone/phosphate buffer mixture as the solvent system. Investigation of this so far unrecognized stereoselective reaction reveals that it proceeds via an S(N)1-like pathway as indicated by the correlation of the solvolysis rate constants with the Y(OTs) values of different solvent mixtures and by trapping of the reaction intermediate with sodium azide. The structure of (4S,6S)-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-ol-7,7-dioxide was confirmed by single-crystal X-ray analysis. American Chemical Society 2023-07-21 /pmc/articles/PMC10413462/ /pubmed/37576669 http://dx.doi.org/10.1021/acsomega.3c03959 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Martinelli, Andrea
Volpicelli, Raffaella
Verzini, Massimo
Cotarca, Livius
Maini, Lucia
Pengo, Paolo
Pasquato, Lucia
Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates
title Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates
title_full Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates
title_fullStr Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates
title_full_unstemmed Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates
title_short Stereoselective Solvolysis in the Synthesis of Dorzolamide Intermediates
title_sort stereoselective solvolysis in the synthesis of dorzolamide intermediates
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10413462/
https://www.ncbi.nlm.nih.gov/pubmed/37576669
http://dx.doi.org/10.1021/acsomega.3c03959
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