1
|
Pascual-Escudero A, Ortiz-Rojano L, Simón-Fuente S, Adrio J, Ribagorda M. Aldehydes as Photoremovable Directing Groups: Synthesis of Pyrazoles by a Photocatalyzed [3+2] Cycloaddition/Norrish Type Fragmentation Sequence. Org Lett 2021; 23:4903-4908. [PMID: 34097415 DOI: 10.1021/acs.orglett.1c01665] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A straightforward methodology for the regioselective synthesis of pyrazoles has been developed by a domino sequence based on a photoclick cycloaddition followed by a photocatalyzed oxidative deformylation reaction. Distinguishing features of this protocol include an unprecedented photoredox-catalyzed Norrish type fragmentation under green-light irradiation and the use of α,β-unsaturated aldehydes as synthetic equivalents of alkynes, where the aldehyde is acting as a novel photoremovable directing group.
Collapse
Affiliation(s)
- Ana Pascual-Escudero
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Laura Ortiz-Rojano
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Silvia Simón-Fuente
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Javier Adrio
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain.,Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - María Ribagorda
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain.,Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| |
Collapse
|
2
|
Li M, Berritt S, Matuszewski L, Deng G, Pascual-Escudero A, Panetti GB, Poznik M, Yang X, Chruma JJ, Walsh PJ. Transition-Metal-Free Radical C(sp 3)-C(sp 2) and C(sp 3)-C(sp 3) Coupling Enabled by 2-Azaallyls as Super-Electron-Donors and Coupling-Partners. J Am Chem Soc 2017; 139:16327-16333. [PMID: 29019654 PMCID: PMC5737768 DOI: 10.1021/jacs.7b09394] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The past decade has witnessed the rapid development of radical generation strategies and their applications in C-C bond-forming reactions. Most of these processes require initiators, transition metal catalysts, or organometallic reagents. Herein, we report the discovery of a simple organic system (2-azaallyl anions) that enables radical coupling reactions under transition-metal-free conditions. Deprotonation of N-benzyl ketimines generates semistabilized 2-azaallyl anions that behave as "super-electron-donors" (SEDs) and reduce aryl iodides and alkyl halides to aryl and alkyl radicals. The SET process converts the 2-azaallyl anions into persistent 2-azaallyl radicals, which capture the aryl and alkyl radicals to form C-C bonds. The radical coupling of aryl and alkyl radicals with 2-azaallyl radicals makes possible the synthesis of functionalized amine derivatives without the use of exogenous radical initiators or transition metal catalysts. Radical clock studies and 2-azaallyl anion coupling studies provide mechanistic insight for this unique reactivity.
Collapse
Affiliation(s)
- Minyan Li
- Department of Chemistry, Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA
| | - Simon Berritt
- Department of Chemistry, Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA
| | - Lucas Matuszewski
- Department of Chemistry, Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA
| | - Guogang Deng
- Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China
| | - Ana Pascual-Escudero
- Dpto. Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Grace B. Panetti
- Department of Chemistry, Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA
| | - Michal Poznik
- Key Laboratory of Green Chemistry & Technology (MOE), College of Chemistry and Sino-British Materials Research Institute, College of Physical Science & Technology, Sichuan University, No. 29, Wangjiang Road, Chengdu, Sichuan, 610064, China
| | - Xiaodong Yang
- Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China
| | - Jason J. Chruma
- Key Laboratory of Green Chemistry & Technology (MOE), College of Chemistry and Sino-British Materials Research Institute, College of Physical Science & Technology, Sichuan University, No. 29, Wangjiang Road, Chengdu, Sichuan, 610064, China
| | - Patrick J. Walsh
- Department of Chemistry, Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA
| |
Collapse
|
3
|
Molina A, Pascual-Escudero A, Adrio J, Carretero JC. Catalytic Asymmetric 1,3-Dipolar Cycloaddition/Hydroamination Sequence: Expeditious Access to Enantioenriched Pyrroloisoquinoline Derivatives. J Org Chem 2017; 82:11238-11246. [DOI: 10.1021/acs.joc.7b01927] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Alba Molina
- Departamento
de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Ana Pascual-Escudero
- Departamento
de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Javier Adrio
- Departamento
de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
- Institute
for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Juan C. Carretero
- Departamento
de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
- Institute
for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| |
Collapse
|
4
|
Pascual-Escudero A, de Cózar A, Cossío FP, Adrio J, Carretero JC. Alkenyl Arenes as Dipolarophiles in Catalytic Asymmetric 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides. Angew Chem Int Ed Engl 2016; 55:15334-15338. [PMID: 27862800 DOI: 10.1002/anie.201609187] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Indexed: 12/22/2022]
Abstract
The use of alkenyl arenes as dipolarophiles in the catalytic asymmetric 1,3-dipolar cycloaddition of azomethine ylides is reported. Under appropriate reaction conditions with a CuI or AgI catalyst either the exo or the endo adduct was obtained with high stereoselectivity. This process provides efficient access to highly enantiomerically enriched 4-aryl proline derivatives. The observed results are compatible with the blockage of one prochiral face of the 1,3-dipole, as well as with the efficient transmission of electrophilicity towards the terminal carbon atom of the dipolarophile. This polarization results in a change from a concerted to a stepwise mechanism.
Collapse
Affiliation(s)
- Ana Pascual-Escudero
- Dpto. Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Abel de Cózar
- IKERBASQUE, Basque Foundation for Science, 48011, Bilbao, Spain.,Dpto. Química Orgánica I, Facultad de Química, Universidad del País Vasco (UPV/EHU) and Donostia International Physics Center (DIPC), 20018, San Sebastián/Donostia, Spain
| | - Fernando P Cossío
- Dpto. Química Orgánica I, Facultad de Química, Universidad del País Vasco (UPV/EHU) and Donostia International Physics Center (DIPC), 20018, San Sebastián/Donostia, Spain
| | - Javier Adrio
- Dpto. Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Juan C Carretero
- Dpto. Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| |
Collapse
|
5
|
Pascual-Escudero A, de Cózar A, Cossío FP, Adrio J, Carretero JC. Alkenyl Arenes as Dipolarophiles in Catalytic Asymmetric 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609187] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ana Pascual-Escudero
- Dpto. Química Orgánica, Facultad de Ciencias; Universidad Autónoma de Madrid; 28049 Madrid Spain
| | - Abel de Cózar
- IKERBASQUE; Basque Foundation for Science; 48011 Bilbao Spain
- Dpto. Química Orgánica I, Facultad de Química; Universidad del País Vasco (UPV/EHU) and Donostia International Physics Center (DIPC); 20018 San Sebastián/Donostia Spain
| | - Fernando P. Cossío
- Dpto. Química Orgánica I, Facultad de Química; Universidad del País Vasco (UPV/EHU) and Donostia International Physics Center (DIPC); 20018 San Sebastián/Donostia Spain
| | - Javier Adrio
- Dpto. Química Orgánica, Facultad de Ciencias; Universidad Autónoma de Madrid; 28049 Madrid Spain
| | - Juan C. Carretero
- Dpto. Química Orgánica, Facultad de Ciencias; Universidad Autónoma de Madrid; 28049 Madrid Spain
| |
Collapse
|
6
|
Arpa EM, González-Esguevillas M, Pascual-Escudero A, Adrio J, Carretero JC. Catalytic Asymmetric Synthesis of Bicycloprolines by a 1,3-Dipolar Cycloaddition/Intramolecular Alkylation Strategy. J Org Chem 2016; 81:6128-35. [DOI: 10.1021/acs.joc.6b01100] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Enrique M. Arpa
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - María González-Esguevillas
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Ana Pascual-Escudero
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Javier Adrio
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Juan C. Carretero
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| |
Collapse
|
7
|
González-Esguevillas M, Pascual-Escudero A, Adrio J, Carretero JC. Highly Selective Copper-Catalyzed Asymmetric [3+2] Cycloaddition of Azomethine Ylides with Acyclic 1,3-Dienes. Chemistry 2015; 21:4561-5. [DOI: 10.1002/chem.201500182] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Indexed: 01/15/2023]
|
8
|
Pascual-Escudero A, González-Esguevillas M, Padilla S, Adrio J, Carretero JC. Enantioselective Synthesis of α-Heteroarylpyrrolidines by Copper-Catalyzed 1,3-Dipolar Cycloaddition of α-Silylimines. Org Lett 2014; 16:2228-31. [DOI: 10.1021/ol5007373] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ana Pascual-Escudero
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - María González-Esguevillas
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Silvia Padilla
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Javier Adrio
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Juan C. Carretero
- Departamento de Química
Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| |
Collapse
|