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1
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Pal S, Nandi R, Manna AS, Aich S, Maiti DK. Cu I-Catalyzed Radical Reaction of Benzimidates to Form Valuable 4,5-Dihydrooxazoles through Regioselective Aerobic Oxidative Cross-Coupling. J Org Chem 2024; 89:2703-2717. [PMID: 38295826 DOI: 10.1021/acs.joc.3c02773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
A straightforward Cu(I)-catalyzed oxidative cross-coupled organic transformation has been developed under mild conditions for the construction of functionalized 4,5-dihydrooxazoles through a four-bond-forming regiocontrolled C-C/C-N/C-O coupling strategy emerging benzimidates, paraformaldehyde, and 1,3-diketo analogues using eco-friendly O2 as the sole oxidant. The fundamental features of these designed approaches involve operational simplicity, selectivity, generality, and a broad substrate scope with high yields under the same reaction conditions.
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Affiliation(s)
- Subhasis Pal
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Rajesh Nandi
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Anindya S Manna
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Shobhon Aich
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Dilip K Maiti
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
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2
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Giofrè S, Keller M, Lo Presti L, Beccalli EM, Molteni L. Switchable Oxidative Reactions of N-allyl-2-Aminophenols: Palladium-Catalyzed Alkoxyacyloxylation vs an Intramolecular Diels-Alder Reaction. Org Lett 2021; 23:7698-7702. [PMID: 34570517 PMCID: PMC8524420 DOI: 10.1021/acs.orglett.1c02539] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The Pd(II)-catalyzed
reaction of N-allyl-2-aminophenols
in the presence of PhI(OCOR)2 as the oxidant resulted in
an alkoxyacyloxylation process, with the formation of functionalized
dihydro-1,4-benzoxazines. The reaction performed in the absence of
palladium catalyst switched to an intramolecular Diels–Alder
reaction (IMDA) pathway, which was the result of an oxidative dearomatization
of the 2-aminophenol, nucleophilic addition, and Diels–Alder
reaction cascade, highlighting the role of the oxidant as both a nucleophilic
donor and an oxidizing agent.
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Affiliation(s)
- Sabrina Giofrè
- DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini", Università degli Studi di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Manfred Keller
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg im Breisgau, Germany
| | - Leonardo Lo Presti
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
| | - Egle M Beccalli
- DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini", Università degli Studi di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Letizia Molteni
- DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini", Università degli Studi di Milano, Via Venezian 21, 20133 Milano, Italy
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3
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Gazzola S, Beccalli EM, Borelli T, Castellano C, Chiacchio MA, Diamante D, Broggini G. Copper(II)-Catalyzed Alkoxyhalogenation of Alkynyl Ureas and Amides as a Route to Haloalkylidene-Substituted Heterocycles. J Org Chem 2015; 80:7226-34. [PMID: 26111065 DOI: 10.1021/acs.joc.5b01227] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A highly effective synthesis of haloalkylidene-substituted heterocycles by copper(II)-catalyzed cyclization of alkynyl ureas and secondary amides has been developed. The reaction, which involves a catalytic amount of CuCl2 and a stoichiometric amount of N-halosuccinimide, occurs selectively through an alkoxyhalogenation process. Alternatively, alkoxychlorination and alkoxybromination reactions can be performed working solely with stoichiometric CuCl2 and CuBr2, respectively.
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Affiliation(s)
- Silvia Gazzola
- †Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
| | - Egle M Beccalli
- ‡DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini", Università degli Studi di Milano, via Venezian 21, 20133 Milano, Italy
| | - Tea Borelli
- †Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
| | - Carlo Castellano
- §Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy
| | - Maria Assunta Chiacchio
- ∥Dipartimento di Scienze del Farmaco, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy
| | - Daria Diamante
- †Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
| | - Gianluigi Broggini
- †Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
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4
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Zhang Z, Ouyang L, Wu W, Li J, Zhang Z, Jiang H. Palladium-Catalyzed Intermolecular Oxyvinylcyclization of Alkenes with Alkynes: An Approach to 3-Methylene γ-Lactones and Tetrahydrofurans. J Org Chem 2014; 79:10734-42. [DOI: 10.1021/jo501606c] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Zhenming Zhang
- School
of Chemistry and Chemical
Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Lu Ouyang
- School
of Chemistry and Chemical
Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Wanqing Wu
- School
of Chemistry and Chemical
Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Jianxiao Li
- School
of Chemistry and Chemical
Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Zhicai Zhang
- School
of Chemistry and Chemical
Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Huanfeng Jiang
- School
of Chemistry and Chemical
Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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5
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Fujino D, Yorimitsu H, Osuka A. Regiocontrolled Palladium-Catalyzed Arylative Cyclizations of Alkynols. J Am Chem Soc 2014; 136:6255-8. [DOI: 10.1021/ja5029028] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Daishi Fujino
- Department
of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department
of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- ACT-C, JST, Sakyo-ku, Kyoto 606-8502, Japan
| | - Atsuhiro Osuka
- Department
of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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6
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Chiacchio U, Barbera V, Bonfanti R, Broggini GL, Campisi A, Gazzola S, Parenti R, Romeo G. Synthesis and biological evaluation of 1,7,8,8a-tetrahydro-3H-oxazolo[3,4-a]pyrazin-6(5H)-ones as antitumoral agents. Bioorg Med Chem 2013; 21:5748-53. [PMID: 23916151 DOI: 10.1016/j.bmc.2013.07.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 07/08/2013] [Accepted: 07/09/2013] [Indexed: 10/26/2022]
Abstract
A series of 1,7,8,8a-tetrahydro-3H-oxazolo[3,4-a]pyrazin-6(5H)-ones has been synthesized by an intramolecular, palladium(II) catalyzed, aminooxygenation of alkenyl ureas, readily available from glycine allylamides as starting materials. Biological tests showed that the obtained compounds are endowed with an interesting antitumoral activity against two human thyroid cancer cell lines, namely FTC-133 and 8305C, by promoting the apoptotic pathway and DNA fragmentation.
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Affiliation(s)
- Ugo Chiacchio
- Dipartimento di Scienze del Farmaco, Università di Catania, Italy.
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