Cargando…

Site-selective bromination of sp(3) C–H bonds

A method for converting sp(3) C–H to C–Br bonds using an N-methyl sulfamate directing group is described. The reaction employs Rh(2)(oct)(4) and a mixture of NaBr and NaOCl and is performed in aqueous solution open to air. For all sulfamates examined, oxidation occurs with high selectivity at the γ-...

Descripción completa

Detalles Bibliográficos
Autores principales: Sathyamoorthi, Shyam, Banerjee, Shibdas, Du Bois, J., Burns, Noah Z., Zare, Richard N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Royal Society of Chemistry 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5873043/
https://www.ncbi.nlm.nih.gov/pubmed/29629078
http://dx.doi.org/10.1039/c7sc04611a
_version_ 1783309966149419008
author Sathyamoorthi, Shyam
Banerjee, Shibdas
Du Bois, J.
Burns, Noah Z.
Zare, Richard N.
author_facet Sathyamoorthi, Shyam
Banerjee, Shibdas
Du Bois, J.
Burns, Noah Z.
Zare, Richard N.
author_sort Sathyamoorthi, Shyam
collection PubMed
description A method for converting sp(3) C–H to C–Br bonds using an N-methyl sulfamate directing group is described. The reaction employs Rh(2)(oct)(4) and a mixture of NaBr and NaOCl and is performed in aqueous solution open to air. For all sulfamates examined, oxidation occurs with high selectivity at the γ-carbon, affording a uniquely predictable method for C–H bond halogenation. Results from a series of mechanistic experiments suggest that substrate oxidation likely proceeds by a radical chain process. Initial formation of an N-halogenated sulfamate followed by Rh-mediated homolysis generates an N-centered radical, which serves as the active oxidant.
format Online
Article
Text
id pubmed-5873043
institution National Center for Biotechnology Information
language English
publishDate 2017
publisher Royal Society of Chemistry
record_format MEDLINE/PubMed
spelling pubmed-58730432018-04-06 Site-selective bromination of sp(3) C–H bonds Sathyamoorthi, Shyam Banerjee, Shibdas Du Bois, J. Burns, Noah Z. Zare, Richard N. Chem Sci Chemistry A method for converting sp(3) C–H to C–Br bonds using an N-methyl sulfamate directing group is described. The reaction employs Rh(2)(oct)(4) and a mixture of NaBr and NaOCl and is performed in aqueous solution open to air. For all sulfamates examined, oxidation occurs with high selectivity at the γ-carbon, affording a uniquely predictable method for C–H bond halogenation. Results from a series of mechanistic experiments suggest that substrate oxidation likely proceeds by a radical chain process. Initial formation of an N-halogenated sulfamate followed by Rh-mediated homolysis generates an N-centered radical, which serves as the active oxidant. Royal Society of Chemistry 2017-11-20 /pmc/articles/PMC5873043/ /pubmed/29629078 http://dx.doi.org/10.1039/c7sc04611a Text en This journal is © The Royal Society of Chemistry 2018 http://creativecommons.org/licenses/by/3.0/ This article is freely available. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (CC BY 3.0)
spellingShingle Chemistry
Sathyamoorthi, Shyam
Banerjee, Shibdas
Du Bois, J.
Burns, Noah Z.
Zare, Richard N.
Site-selective bromination of sp(3) C–H bonds
title Site-selective bromination of sp(3) C–H bonds
title_full Site-selective bromination of sp(3) C–H bonds
title_fullStr Site-selective bromination of sp(3) C–H bonds
title_full_unstemmed Site-selective bromination of sp(3) C–H bonds
title_short Site-selective bromination of sp(3) C–H bonds
title_sort site-selective bromination of sp(3) c–h bonds
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5873043/
https://www.ncbi.nlm.nih.gov/pubmed/29629078
http://dx.doi.org/10.1039/c7sc04611a
work_keys_str_mv AT sathyamoorthishyam siteselectivebrominationofsp3chbonds
AT banerjeeshibdas siteselectivebrominationofsp3chbonds
AT duboisj siteselectivebrominationofsp3chbonds
AT burnsnoahz siteselectivebrominationofsp3chbonds
AT zarerichardn siteselectivebrominationofsp3chbonds