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- Publisher Website: 10.1021/acs.joc.1c00457
- Scopus: eid_2-s2.0-85108666245
- PMID: 34107217
- WOS: WOS:000664332300016
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Article: Mechanistic Insights into Rapid Generation of Nitroxyl from a Photocaged N-Hydroxysulfonamide Incorporating the (6-Hydroxynaphthalen-2-yl)methyl Chromophore
Title | Mechanistic Insights into Rapid Generation of Nitroxyl from a Photocaged N-Hydroxysulfonamide Incorporating the (6-Hydroxynaphthalen-2-yl)methyl Chromophore |
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Authors | |
Issue Date | 2021 |
Publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/joc |
Citation | The Journal of Organic Chemistry, 2021, v. 86 n. 12, p. 8056-8068 How to Cite? |
Abstract | HNO is a highly reactive molecule that shows promise in treating heart failure. Molecules that rapidly release HNO with precise spatial and temporal control are needed to investigate the biology of this signaling molecule. (Hydroxynaphthalen-2-yl)methyl-photocaged N-hydroxysulfonamides are a new class of photoactive HNO generators. Recently, it was shown that a (6-hydroxynaphthalen-2-yl)methyl (6,2-HNM)-photocaged derivative of N-hydroxysulfonamide incorporating the trifluoromethanesulfonamidoxy group (1) quantitatively generates HNO. Mechanistic studies have now been carried out on this system and reveal that the ground state protonation state plays a key role in whether concerted heterolytic C–O/N–S bond cleavage to release HNO occurs versus undesired O–N bond cleavage. N-Deprotonation of 1 can be achieved by adding an aqueous buffer or a carboxylate salt to an aprotic solvent. Evidence is presented for C–O/N–S bond heterolysis occurring directly from the singlet excited state of the N-deprotonated parent molecule on the picosecond time scale, using femtosecond time-resolved transient absorption spectroscopy, to give a carbocation and 1NO–. This is consistent with the observation of significant fluorescence quenching when HNO is generated. The carbocation intermediate reacts rapidly with nucleophiles including water, MeOH, or even (H)NO in the absence of a molecule that reacts rapidly with (H)NO to give an oxime. |
Persistent Identifier | http://hdl.handle.net/10722/300770 |
ISSN | 2023 Impact Factor: 3.3 2023 SCImago Journal Rankings: 0.724 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Cink, RB | - |
dc.contributor.author | Zhou, Y | - |
dc.contributor.author | Du, L | - |
dc.contributor.author | Rahman, MS | - |
dc.contributor.author | Phillips, DL | - |
dc.contributor.author | Simpson, MC | - |
dc.contributor.author | Seed, AJ | - |
dc.contributor.author | Sampson, P | - |
dc.contributor.author | Brasch, NE | - |
dc.date.accessioned | 2021-07-06T03:10:00Z | - |
dc.date.available | 2021-07-06T03:10:00Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | The Journal of Organic Chemistry, 2021, v. 86 n. 12, p. 8056-8068 | - |
dc.identifier.issn | 0022-3263 | - |
dc.identifier.uri | http://hdl.handle.net/10722/300770 | - |
dc.description.abstract | HNO is a highly reactive molecule that shows promise in treating heart failure. Molecules that rapidly release HNO with precise spatial and temporal control are needed to investigate the biology of this signaling molecule. (Hydroxynaphthalen-2-yl)methyl-photocaged N-hydroxysulfonamides are a new class of photoactive HNO generators. Recently, it was shown that a (6-hydroxynaphthalen-2-yl)methyl (6,2-HNM)-photocaged derivative of N-hydroxysulfonamide incorporating the trifluoromethanesulfonamidoxy group (1) quantitatively generates HNO. Mechanistic studies have now been carried out on this system and reveal that the ground state protonation state plays a key role in whether concerted heterolytic C–O/N–S bond cleavage to release HNO occurs versus undesired O–N bond cleavage. N-Deprotonation of 1 can be achieved by adding an aqueous buffer or a carboxylate salt to an aprotic solvent. Evidence is presented for C–O/N–S bond heterolysis occurring directly from the singlet excited state of the N-deprotonated parent molecule on the picosecond time scale, using femtosecond time-resolved transient absorption spectroscopy, to give a carbocation and 1NO–. This is consistent with the observation of significant fluorescence quenching when HNO is generated. The carbocation intermediate reacts rapidly with nucleophiles including water, MeOH, or even (H)NO in the absence of a molecule that reacts rapidly with (H)NO to give an oxime. | - |
dc.language | eng | - |
dc.publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/joc | - |
dc.relation.ispartof | The Journal of Organic Chemistry | - |
dc.rights | This document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html]. | - |
dc.title | Mechanistic Insights into Rapid Generation of Nitroxyl from a Photocaged N-Hydroxysulfonamide Incorporating the (6-Hydroxynaphthalen-2-yl)methyl Chromophore | - |
dc.type | Article | - |
dc.identifier.email | Du, L: ailleen@hku.hk | - |
dc.identifier.email | Phillips, DL: phillips@hku.hk | - |
dc.identifier.authority | Phillips, DL=rp00770 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1021/acs.joc.1c00457 | - |
dc.identifier.pmid | 34107217 | - |
dc.identifier.scopus | eid_2-s2.0-85108666245 | - |
dc.identifier.hkuros | 323189 | - |
dc.identifier.volume | 86 | - |
dc.identifier.issue | 12 | - |
dc.identifier.spage | 8056 | - |
dc.identifier.epage | 8068 | - |
dc.identifier.isi | WOS:000664332300016 | - |
dc.publisher.place | United States | - |