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Ramiro JL, Martínez-Caballero S, Neo AG, Díaz J, Marcos CF. The Castagnoli–Cushman Reaction. Molecules 2023; 28:molecules28062654. [PMID: 36985626 PMCID: PMC10058692 DOI: 10.3390/molecules28062654] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 03/11/2023] [Accepted: 03/12/2023] [Indexed: 03/17/2023] Open
Abstract
Since the first reports of the reaction of imines and cyclic anhydrides by Castagnoli and Cushman, this procedure has been applied to the synthesis of a variety of lactams, some of them with important synthetic or biological interest. The scope of the reaction has been extended to the use of various Schiff bases and anhydrides as well as to different types of precursors for these reagents. In recent years, important advances have been made in understanding the mechanism of the reaction, which has historically been quite controversial. This has helped to develop reaction conditions that lead to pure diastereomers and even homochiral products. In addition, these mechanistic studies have also led to the development of new multicomponent versions of the Castagnoli–Cushman reaction that allow products with more diverse and complex molecular structures to be easily obtained.
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Affiliation(s)
- José Luis Ramiro
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
| | - Sonia Martínez-Caballero
- Departamento de Didáctica de las Ciencias Experimentales y las Matemáticas, Facultad de Formación de Profesorado, Universidad de Extremadura, 10003 Cáceres, Spain
| | - Ana G. Neo
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
- Correspondence: (A.G.N.); (C.F.M.)
| | - Jesús Díaz
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
| | - Carlos F. Marcos
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
- Correspondence: (A.G.N.); (C.F.M.)
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2
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The Use of Aryl-Substituted Homophthalic Anhydrides in the Castagnoli-Cushman Reaction Provides Access to Novel Tetrahydroisoquinolone Carboxylic Acid Bearing an All-Carbon Quaternary Stereogenic Center. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238462. [PMID: 36500582 PMCID: PMC9738897 DOI: 10.3390/molecules27238462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/28/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Novel aryl-substituted homophthalic acids were cyclodehydrated to the respective homophthalic anhydrides for use in the Castagnoli-Cushman reaction. With a range of imines, this reaction proceeded smoothly and delivered hitherto undescribed 4-aryl-substituted tetrahydroisoquinolonic acids with remarkable diastereoselectivity, good yields and no need for chromatographic purification. These findings significantly extend the range of cyclic anhydrides employable in the Castagnoli-Cushman reaction and signify access to a novel substitution pattern around the medicinally relevant tetrahydroisoquinolonic acid scaffold.
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3
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Lebedev R, Dar’in D, Kantin G, Bakulina O, Krasavin M. One-Pot Sequence of Staudinger/aza-Wittig/Castagnoli-Cushman Reactions Provides Facile Access to Novel Natural-like Polycyclic Ring Systems. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238130. [PMID: 36500222 PMCID: PMC9735558 DOI: 10.3390/molecules27238130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/09/2022] [Accepted: 11/14/2022] [Indexed: 11/25/2022]
Abstract
Realization of the one-pot Staudinger/aza-Wittig/Castagnoli-Cushman reaction sequence for a series of azido aldehydes and homophthalic anhydrides is described. The reaction proceeded at room temperature and delivered novel polyheterocycles related to the natural product realm in high yields and high diastereoselectivity. The methodology has been extended to three other cyclic anhydrides. These further unravel the potential of the Castagnoli-Cushman reaction in generating polyheterocyclic molecular scaffolds.
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Affiliation(s)
- Rodion Lebedev
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, Peterhof 198504, Russia
| | - Dmitry Dar’in
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, Peterhof 198504, Russia
| | - Grigory Kantin
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, Peterhof 198504, Russia
| | - Olga Bakulina
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, Peterhof 198504, Russia
| | - Mikhail Krasavin
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, Peterhof 198504, Russia
- Institute of Living Systems, Immanuel Kant Baltic Federal University, Kaliningrad 236041, Russia
- Correspondence:
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4
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Ananeva A, Bakulina O, Dar’in D, Kantin G, Krasavin M. Dicarboxylic Acid Monoesters in β- and δ-Lactam Synthesis. Molecules 2022; 27:molecules27082469. [PMID: 35458663 PMCID: PMC9032910 DOI: 10.3390/molecules27082469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/03/2022] [Accepted: 04/08/2022] [Indexed: 02/01/2023] Open
Abstract
A N-(2-methoxy-2-oxoethyl)-N-(phenylsulfonyl)glycine monomethyl ester of the respective dicarboxylic acid was involved in a reaction with imines promoted by acetic anhydride at an elevated temperature. Instead of the initially expected δ-lactam products of the Castagnoli–Cushman-type reaction, medicinally important 3-amino-2-azetidinones were obtained as the result of cyclization, involving a methylene group adjacent to an acid moiety. In contrast, replacing alcohol residue with hexafluoroisopropyl in the same substrate made another methylene group (adjacent to the ester moiety) more reactive to furnishing the desired δ-lactam in the Castagnoli–Cushman fashion.
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Affiliation(s)
- Anna Ananeva
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, 198504 Peterhof, Russia; (A.A.); (D.D.); (G.K.)
| | - Olga Bakulina
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, 198504 Peterhof, Russia; (A.A.); (D.D.); (G.K.)
- Correspondence: (O.B.); (M.K.)
| | - Dmitry Dar’in
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, 198504 Peterhof, Russia; (A.A.); (D.D.); (G.K.)
| | - Grigory Kantin
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, 198504 Peterhof, Russia; (A.A.); (D.D.); (G.K.)
| | - Mikhail Krasavin
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, 198504 Peterhof, Russia; (A.A.); (D.D.); (G.K.)
- Institute of Living Systems, Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia
- Correspondence: (O.B.); (M.K.)
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5
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Firsov A, Bakulina O, Dar'in D, Sokolov VV, Krasavin M. Synthesis of γ-Sultam-Annelated δ-Lactams via the Castagnoli-Cushman Reaction of Sultam-Based Dicarboxylic Acids. J Org Chem 2022; 87:1537-1540. [PMID: 35000381 DOI: 10.1021/acs.joc.1c02456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An unusual type of highly reactive sultam-based dicarboxylic acids and correscponding anhydrides was employed in the Castagnoli-Cushman reaction delivering diastereomerically pure adducts at room temperature. Due to steric congestion, the initial adducts were prone to decarboxylation affording diastereomeric mixtures of bicyclic sultam lactams, separable by HPLC. The choice of a protecting group on the sultam nitrogen atom allows liberation of the NH-sultam, which is not only suitable for further modification but represents a known pharmacophore for carbonic anhydrase inhibition.
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Affiliation(s)
- Andrey Firsov
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Olga Bakulina
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Dmitry Dar'in
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Viktor V Sokolov
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Mikhail Krasavin
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
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6
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Microwave accelerated Castagnoli-Cushman reaction: Synthesis of novel 6,7,8,9-tetrahydropyrido[3′,2′:4,5]pyrrolo[1,2-a]pyrazines. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.152943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Visible-light induced generation of bifunctional nitrogen-centered radicals: a concise synthetic strategy to construct bicyclo[3.2.1] octane and azepane cores. Sci China Chem 2020. [DOI: 10.1007/s11426-020-9852-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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When periphery matters: Enhanced reactivity of 8-oxa-1,4-dithiaspiro[4.5]decane-7,9-dione and 9-oxa-1,5-dithiaspiro[5.5]undecane-8,10-dione in the Castagnoli-Cushman reaction with imines. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152658] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Adamovskyi M, Avramenko MM, Volochnyuk DM, Ryabukhin SV. Fluoral Hydrate: A Perspective Substrate for the Castagnoli-Cushman Reaction. ACS OMEGA 2020; 5:20932-20942. [PMID: 32875228 PMCID: PMC7450650 DOI: 10.1021/acsomega.0c02394] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 08/06/2020] [Indexed: 06/11/2023]
Abstract
The reactivity of azomethines based on trifluoroacetaldehyde hydrate in the Castagnoli-Cushman reaction (CCR) was researched. The impact of the nature of anhydrides explored on the reaction route was determined. The preparative procedures for the synthesis of N-substituted (3R*,4R*)-1-oxo-3-(trifluoromethyl)-1,2,3,4-tetrahydroisoquinoline-4-carboxylic and (1R*,2R*)-4-oxo-2-(trifluoromethyl)-2,3,4,5-tetrahydro-1H-benzo[d]azepine-1-carboxylic acids in gram scales were elaborated. It was shown that the trifluoromethyl group remarkably decreased the reactivity of azomethines in CCR. The mechanism for the formation of different products depending on the anhydride's nature was proposed.
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Affiliation(s)
- Mykhailo
I. Adamovskyi
- Enamine
Ltd., Chervonotkatska
Street 78, Kyiv 02094, Ukraine
- Taras
Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv 01601, Ukraine
| | - Mykola M. Avramenko
- Enamine
Ltd., Chervonotkatska
Street 78, Kyiv 02094, Ukraine
- Taras
Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv 01601, Ukraine
| | - Dmitriy M. Volochnyuk
- Enamine
Ltd., Chervonotkatska
Street 78, Kyiv 02094, Ukraine
- Taras
Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv 01601, Ukraine
- Institute
of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Street 5, Kyiv 02660, Ukraine
| | - Sergey V. Ryabukhin
- Enamine
Ltd., Chervonotkatska
Street 78, Kyiv 02094, Ukraine
- Taras
Shevchenko National University of Kyiv, Volodymyrska Street 64, Kyiv 01601, Ukraine
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10
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The Castagnoli–Cushman reaction of bicyclic pyrrole dicarboxylic anhydrides bearing electron-withdrawing substituents. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.07.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Firsov A, Bakulina O, Dar'in D, Guranova N, Krasavin M. Further Insight into the Castagnoli-Cushman-type Synthesis of 1,4,6-Trisubstituted 1,6-Dihydropyridin-2-(3 H)-ones from 3-Arylglutaconic Acid Anhydrides. J Org Chem 2020; 85:6822-6829. [PMID: 32338899 DOI: 10.1021/acs.joc.0c00836] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The earlier reported three-component Castagnoli-Cushman-type synthesis of 1,4,6-trisubstituted 1,6-dihydropyridin-2-(3H)-ones from 3-arylglutaconic acids, primary amines, and aromatic aldehydes has been further investigated. It was shown to proceed via 3-arylglutaconic anhydrides, which, in turn, were found to give superior results in the two-component reactions with imines. The initial formation of the Castagnoli-Cushman carboxylic acids was shown to be the case, and their decarboxylation was found to follow a complex, "forked" pathway, which was confirmed by deuterium incorporation experiments.
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Affiliation(s)
- Andrei Firsov
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Olga Bakulina
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Dmitry Dar'in
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Natalia Guranova
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Mikhail Krasavin
- Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
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12
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Pinna A, Basso A, Lambruschini C, Moni L, Riva R, Rocca V, Banfi L. Stereodivergent access to all four stereoisomers of chiral tetrahydrobenzo[f][1,4]oxazepines, through highly diastereoselective multicomponent Ugi–Joullié reaction. RSC Adv 2020; 10:965-972. [PMID: 35494435 PMCID: PMC9047508 DOI: 10.1039/c9ra10689h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 12/20/2019] [Indexed: 12/25/2022] Open
Abstract
Starting from easily accessible chiral enantiopure 1,2-amino alcohols and salicylaldehydes, a concise route to cyclic imines has been developed. These chiral cyclic imines undergo a highly diastereoselective Ugi–Joullié reaction to give trans tetrahydrobenzo[f][1,4]oxazepines with the introduction of up to 4 diversity inputs. The cis isomer may also be attained, thanks to a thermodynamically controlled base catalysed epimerization. Free secondary amines have been obtained using an unprecedented “removable” carboxylic acid. Starting from easily accessible enantiopure 1,2-aminoalcohols and salicylaldehydes, a concise and diastereodivergent route to tetrahydrobenzo[f][1,4]oxazepines has been developed.![]()
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Affiliation(s)
- Alessandro Pinna
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | - Andrea Basso
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | | | - Lisa Moni
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | - Renata Riva
- Department of Pharmacy
- Università di Genova
- Italy
| | - Valeria Rocca
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | - Luca Banfi
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
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13
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Wu L, Zatolochnaya O, Qu B, Wu L, Wells LA, Kozlowski MC, Senanayake CH, Song JJ, Zhang Y. Cu-Catalyzed Asymmetric Aminoboration of E-Vinylarenes with pivZPhos as the Ligand. Org Lett 2019; 21:8952-8956. [PMID: 31647668 DOI: 10.1021/acs.orglett.9b03328] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A Cu-catalyzed enantioselective aminoboration of E-vinylarenes with pivZPhos as a ligand is reported. Enantioenriched aminoborates are prepared with excellent regio- and enantioselectivities up to >99:1 er under the optimized conditions. The utility of the current method was further established by rapid conversion of an adduct to a chiral benzo[f][1,4]oxazepine. A model for the stereochemistry of the asymmetric aminoboration process, which agrees with the experimental outcomes, was generated by computational analysis of the systems.
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Affiliation(s)
- Linglin Wu
- Department of Chemical Development , Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , P.O. Box 368, Ridgefield , Connecticut 06877-0368 , United States
| | - Olga Zatolochnaya
- Department of Chemical Development , Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , P.O. Box 368, Ridgefield , Connecticut 06877-0368 , United States
| | - Bo Qu
- Department of Chemical Development , Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , P.O. Box 368, Ridgefield , Connecticut 06877-0368 , United States
| | - Ling Wu
- Department of Chemical Development , Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , P.O. Box 368, Ridgefield , Connecticut 06877-0368 , United States
| | - Lucille A Wells
- Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Marisa C Kozlowski
- Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Chris H Senanayake
- Department of Chemical Development , Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , P.O. Box 368, Ridgefield , Connecticut 06877-0368 , United States
| | - Jinhua J Song
- Department of Chemical Development , Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , P.O. Box 368, Ridgefield , Connecticut 06877-0368 , United States
| | - Yongda Zhang
- Department of Chemical Development , Boehringer Ingelheim Pharmaceuticals, Inc. , 900 Ridgebury Road , P.O. Box 368, Ridgefield , Connecticut 06877-0368 , United States
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14
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Synofzik J, Dar’in D, Novikov MS, Kantin G, Bakulina O, Krasavin M. α-Acyl-α-diazoacetates in Transition-Metal-Free β-Lactam Synthesis. J Org Chem 2019; 84:12101-12110. [DOI: 10.1021/acs.joc.9b02030] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Judith Synofzik
- Saint Petersburg State University, Saint Petersburg 199034, Russia
| | - Dmitry Dar’in
- Saint Petersburg State University, Saint Petersburg 199034, Russia
| | | | - Grigory Kantin
- Saint Petersburg State University, Saint Petersburg 199034, Russia
| | - Olga Bakulina
- Saint Petersburg State University, Saint Petersburg 199034, Russia
| | - Mikhail Krasavin
- Saint Petersburg State University, Saint Petersburg 199034, Russia
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15
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Martínez-Mingo M, Rodríguez N, Gómez Arrayás R, Carretero JC. Access to Benzazepinones by Pd-Catalyzed Remote C–H Carbonylation of γ-Arylpropylamine Derivatives. Org Lett 2019; 21:4345-4349. [DOI: 10.1021/acs.orglett.9b01523] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Mario Martínez-Mingo
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
| | - Nuria Rodríguez
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, Cantoblanco, 28049 Madrid, Spain
| | - Ramón Gómez Arrayás
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, Cantoblanco, 28049 Madrid, Spain
| | - Juan C. Carretero
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, Cantoblanco, 28049 Madrid, Spain
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16
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Chizhova M, Khoroshilova O, Dar'in D, Krasavin M. Unusually Reactive Cyclic Anhydride Expands the Scope of the Castagnoli-Cushman Reaction. J Org Chem 2018; 83:12722-12733. [PMID: 30226770 DOI: 10.1021/acs.joc.8b02164] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In the course of synthesizing and testing various "azole-including" cyclic anhydrides in the Castagnoli-Cushman reaction with imines, a remarkably reactive, pyrrole-based anhydride has been identified. It displayed a remarkably efficient reaction with N-alkyl and N-aryl imines, in particular, with "enolizable" α-C-H imines which typically fail to react with a majority of known cyclic anhydrides. The reactivity of this anhydride has been justified by an efficient resonance stabilization of its enol form. This finding expands the existing arsenal of highly reactive cyclic anhydrides and further confirms the importance of anhydride enolization for an efficient Castagnoli-Cushman reaction.
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Affiliation(s)
- Maria Chizhova
- Saint Petersburg State University , Saint Petersburg , 199034 Russian Federation
| | - Olesya Khoroshilova
- Saint Petersburg State University , Saint Petersburg , 199034 Russian Federation
| | - Dmitry Dar'in
- Saint Petersburg State University , Saint Petersburg , 199034 Russian Federation
| | - Mikhail Krasavin
- Saint Petersburg State University , Saint Petersburg , 199034 Russian Federation
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17
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Chizhova M, Khoroshilova O, Dar'in D, Krasavin M. Acetic anhydride to the rescue: Facile access to privileged 1,2,3,4-tetrahydropyrazino[1,2-a]indole core via the Castagnoli-Cushman reaction. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.08.049] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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