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Daiger MT, Giofré S, Berthold D, Breit B. Rhodium-Catalyzed Enantioselective Intramolecular Hydroalkoxylation of Allenes and Application in the Total Synthesis of (R,R,R)-α-Tocopherol. Chemistry 2024; 30:e202402010. [PMID: 38855991 DOI: 10.1002/chem.202402010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Revised: 06/07/2024] [Accepted: 06/10/2024] [Indexed: 06/11/2024]
Abstract
We report herein of a novel, enantioselective and rhodium- catalyzed cyclisation of allenyl alcohols towards chiral α-vinylic, cyclic ethers employing a rhodium/(R,R)-Me-ferrocelane catalyst. The corresponding chiral cyclic products were obtained in general high yields and enantioselectivities. The synthetic value of our obtained products was further exemplified by transformations of the allylic ether function. Furthermore, applying our newly developed method in our previously reported route towards the total synthesis of (R,R,R)-α-tocopherol, we accomplished a significantly improved 2nd generation synthesis of the chromane building providing a total number of 13 steps and an overall total yield of 27 %.
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Affiliation(s)
- Martin T Daiger
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104, Freiburg im Breisgau, Germany
| | - Sabrina Giofré
- DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini", Università degli Studi di Milano, Via Venezian 21, 20133, Milano, Italy
| | - Dino Berthold
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, Haus F, 81377, München, Germany
| | - Bernhard Breit
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104, Freiburg im Breisgau, Germany
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Uredi D, Burra AG, Watkins EB. Rapid Access to 3-Substituted Pyridines and Carbolines via a Domino, Copper-free, Palladium-Catalyzed Sonogashira Cross-Coupling/6π-Aza Cyclization Sequence. J Org Chem 2021; 86:17748-17761. [PMID: 34846892 DOI: 10.1021/acs.joc.1c02034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we report a one-pot, three-component method for the preparation of 3-substituted pyridines and carbolines via copper-free, palladium-catalyzed Sonogashira cross-coupling with aryl iodides, followed by 6π-aza cyclization. This arylation cross-coupling/annulation cascade provides easy access to substituted, fused pyridines from readily available substrates in good yields (67-92%) with complete selectivity.
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Affiliation(s)
- Dilipkumar Uredi
- Department of Pharmaceutical Sciences, Center for Pharmacometrics and Molecular Discovery, College of Pharmacy, Union University, Jackson 38305, Tennessee, United States
| | - Amarender Goud Burra
- Department of Pharmaceutical Sciences, Center for Pharmacometrics and Molecular Discovery, College of Pharmacy, Union University, Jackson 38305, Tennessee, United States
| | - E Blake Watkins
- Department of Pharmaceutical Sciences, Center for Pharmacometrics and Molecular Discovery, College of Pharmacy, Union University, Jackson 38305, Tennessee, United States
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Palladium Nanoparticles Supported on Smopex-234® as Valuable Catalysts for the Synthesis of Heterocycles. Catalysts 2021. [DOI: 10.3390/catal11060706] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Supported catalysts are important tools for developing green-economy-based processes. Palladium nanoparticles (NPs) that are immobilized on two fibers developed as metal scavengers (i.e., Smopex®-234 and Smopex®-111, 1% w/w) have been prepared and tested in copper-free cyclocarbonylative Sonogashira reactions. Their catalytic activity has been compared with that of a homogeneous catalyst (i.e., PdCl2(PPh3)2). Pd/Smopex®-234 showed high activity and selectivity in the synthesis of functionalized heterocycles, such as phthalans and isochromans, even when working with a very low amount of palladium (0.2–0.5 mol%). The extension of Pd/Smopex®-234 promoted cyclocarbonylative reactions to propargyl and homopropargyl amides afforded the corresponding isoindoline and dihydrobenzazepine derivatives. A preliminary test on Pd NPs leaching into the solution (1.7 × 10−3 mg) seems to indicate that, at the end of the reaction, almost all of the active metal is present on the fiber surface.
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Wu C, Yang X, Shang Y, Cheng HG, Yan W, Zhou Q. Synthesis of Benzofused Dioxabicycle Scaffolds via a Catellani Strategy. Org Lett 2019; 21:8938-8942. [PMID: 31670522 DOI: 10.1021/acs.orglett.9b03228] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reported is a modular strategy for the preparation of the unique benzofused dioxabicycle scaffolds involving a Catellani reaction of aryl iodides, epoxides, and terminal alkynes and an oxa-cyclization. This is a mild, scalable, chemoselective, and atom-economical protocol, compatible with various functionalized aryl iodides, epoxides, and terminal alkynes. With the ability to build up the molecular complexity rapidly and efficiently from feedstock chemicals, this method will have wide applications in organic synthesis.
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Affiliation(s)
- Chenggui Wu
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences , Wuhan University , 430072 Wuhan , China
| | - Xinjun Yang
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences , Wuhan University , 430072 Wuhan , China
| | - Yong Shang
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences , Wuhan University , 430072 Wuhan , China
| | - Hong-Gang Cheng
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences , Wuhan University , 430072 Wuhan , China
| | - Wei Yan
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences , Wuhan University , 430072 Wuhan , China
| | - Qianghui Zhou
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences , Wuhan University , 430072 Wuhan , China.,Institute for Advanced Studies , Wuhan University , 430072 Wuhan , China
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Albano G, Aronica LA. Potentiality and Synthesis of O- and N-Heterocycles: Pd-Catalyzed Cyclocarbonylative Sonogashira Coupling as a Valuable Route to Phthalans, Isochromans, and Isoindolines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701041] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
| | - Laura Antonella Aronica
- Dipartimento di Chimica e Chimica Industriale; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
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Aronica LA, Albano G, Giannotti L, Meucci E. Synthesis of N-Heteroaromatic Compounds through Cyclocarbonylative Sonogashira Reactions. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601392] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Laura Antonella Aronica
- Dipartimento di Chimica e Chimica Industriale; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
| | - Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
| | - Luca Giannotti
- Dipartimento di Chimica e Chimica Industriale; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
| | - Elisa Meucci
- Dipartimento di Chimica e Chimica Industriale; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
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Prabhu RN, Ramesh R. Square-planar Ni(II) thiosemicarbazonato complex as an easily accessible and convenient catalyst for Sonogashira cross-coupling reaction. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.09.049] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Copper-free Sonogashira reactions catalyzed by a palladium(II) complex bearing pyrenealdehyde thiosemicarbazonate under ambient conditions. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.07.076] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Aronica LA, Giannotti L, Tuci G, Zinna F. Cyclocarbonylative Sonogashira Reactions of 1-Ethynylbenzyl Alcohols: Synthesis of 1-Carbonylmethylene-1,3-Dihydroisobenzofurans. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500539] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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