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Fulton BB, Hartzell AJ, Dias HVR, Lovely CJ. Room Temperature Diels-Alder Reactions of 4-Vinylimidazoles. Molecules 2024; 29:1902. [PMID: 38675720 PMCID: PMC11053432 DOI: 10.3390/molecules29081902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 03/30/2024] [Accepted: 04/05/2024] [Indexed: 04/28/2024] Open
Abstract
In the course of studying Diels-Alder reactions of 4-vinylimidazoles with N-phenylmaleimide, it was discovered that they engage in cycloaddition at room temperature to give high yields of the initial cycloadduct as a single stereoisomer. In certain cases, the product precipitated out of the reaction mixture and could be isolated by simple filtration, thereby avoiding issues with aromatization observed during chromatographic purification. Given these results, intramolecular variants using doubly activated dienophiles were also investigated at room temperature. Amides underwent cycloaddition at room temperature in modest yields, but the initial adducts were not isolable with Nimid-benzyl-protected systems. Attempts to extend these results to the corresponding esters and hydroxamate were less successful with these substrates only undergoing cycloaddition at elevated temperatures in lower yields. Density functional theory calculations were performed to evaluate the putative transition states for both the inter- and intramolecular variants to rationalize experimental observations.
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Affiliation(s)
| | | | | | - Carl J. Lovely
- Department of Chemistry and Biochemistry, University of Texas Arlington, Arlington, TX 76019, USA
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Naulin E, Lombard M, Gandon V, Retailleau P, Elslande EV, Neuville L, Masson G. Enantioselective and Regiodivergent Synthesis of Dihydro-1,2-oxazines from Triene-Carbamates via Chiral Phosphoric Acid-Catalysis. J Am Chem Soc 2023; 145:26504-26515. [PMID: 38011838 DOI: 10.1021/jacs.3c12015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Conjugated trienes are fascinating building blocks for the rapid construction of complex polycyclic compounds. However, limited success has been achieved due to the challenging regioselectivity control. Herein, we report an enantio- and diastereoselective process allowing to regioselectively control the functionalization of NH-triene-carbamates. Synthesis of chiral cis-3,6-dihydro-2H-1,2-oxazines is achieved by a chiral phosphoric acid catalyzed Nitroso-Diels-Alder cycloaddition involving [(1E,3E,5E)-hexa-1,3,5-trien-1-yl]carbamates. Moreover, modular access to three different regioisomers with excellent diastereoselectivities and high to excellent enantioselectivities is obtained by a careful choice of the reaction conditions. A computational study reveals that the regioselectivity is influenced by the steric demand of the substituents at the 6-position of the triene, as well as noncovalent interactions between the two cycloaddition partners. Utility of each regioisomeric cycloadduct is highlighted by a variety of synthetic transformations.
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Affiliation(s)
- Emma Naulin
- Institut de Chimie des Substances Naturelles (ICSN), CNRS UPR 2301, Université Paris-Saclay, 1 Avenue de la Terrasse, Gif-sur-Yvette Cedex 91198, France
| | - Marine Lombard
- Institut de Chimie des Substances Naturelles (ICSN), CNRS UPR 2301, Université Paris-Saclay, 1 Avenue de la Terrasse, Gif-sur-Yvette Cedex 91198, France
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, 17 Avenue des Sciences, Orsay 91400, France
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles (ICSN), CNRS UPR 2301, Université Paris-Saclay, 1 Avenue de la Terrasse, Gif-sur-Yvette Cedex 91198, France
| | - Elsa Van Elslande
- Institut de Chimie des Substances Naturelles (ICSN), CNRS UPR 2301, Université Paris-Saclay, 1 Avenue de la Terrasse, Gif-sur-Yvette Cedex 91198, France
| | - Luc Neuville
- Institut de Chimie des Substances Naturelles (ICSN), CNRS UPR 2301, Université Paris-Saclay, 1 Avenue de la Terrasse, Gif-sur-Yvette Cedex 91198, France
- HitCat, Seqens-CNRS Joint Laboratory, Seqens'Lab, 8 Rue de Rouen, Porcheville 78440, France
| | - Géraldine Masson
- Institut de Chimie des Substances Naturelles (ICSN), CNRS UPR 2301, Université Paris-Saclay, 1 Avenue de la Terrasse, Gif-sur-Yvette Cedex 91198, France
- HitCat, Seqens-CNRS Joint Laboratory, Seqens'Lab, 8 Rue de Rouen, Porcheville 78440, France
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Zhu JX, Pi F, Sun T, Huang WY, Gao L, Chen ZC, Du W, Chen YC. Asymmetric 2,4-Dienylation/[4 + 2] Annulation Cascade to Construct Fused Frameworks via Auto-Tandem Palladium Catalysis. Org Lett 2023; 25:3682-3686. [PMID: 37191623 DOI: 10.1021/acs.orglett.3c01084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
A palladium catalyzed tandem reaction between ortho-functionalized aryl enones and 2,4-dienyl carbonates has been presented, proceeding through sequential 2,4-dienylation/Michael addition/π-σ-π isomerization/allylic alkylation. A broad array of enantioenriched architectures having fused and spirocyclic frameworks are constructed in moderate to excellent yields and stereoselectivity. Notably, the intrinsic intramolecular Diels-Alder reaction pattern of the dienylated intermediates is well reversed via Pd(0)-π-Lewis base catalysis.
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Affiliation(s)
- Jian-Xiang Zhu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Fu Pi
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Teng Sun
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Wen-Yu Huang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Zhi-Chao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Wei Du
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
- College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China
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Ma W, Montinho‐Inacio E, Iorga BI, Retailleau P, Moreau X, Neuville L, Masson G. Chiral Phosphoric Acid‐Catalyzed Enantioselective Formal [4+2] Cycloaddition Between Dienecarbamates and 2‐Benzothioazolimines. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200161] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Wei‐Yang Ma
- Institut de Chimie des Substances Naturelles CNRS UPR 2301 Université Paris-Saclay 1, avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
| | - Emeric Montinho‐Inacio
- Institut de Chimie des Substances Naturelles CNRS UPR 2301 Université Paris-Saclay 1, avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
| | - Bogdan I. Iorga
- Institut de Chimie des Substances Naturelles CNRS UPR 2301 Université Paris-Saclay 1, avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles CNRS UPR 2301 Université Paris-Saclay 1, avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
| | - Xavier Moreau
- Institut Lavoisier de Versailles (ILV) UMR CNRS 8180 Université Versailles-St-Quentin-en-Yvelines, Université Paris-Saclay 45 avenue des États-Unis, Bâtiment Lavoisier 78035 Versailles Cedex France
| | - Luc Neuville
- Institut de Chimie des Substances Naturelles CNRS UPR 2301 Université Paris-Saclay 1, avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
- Labcom HITCAT joint lab CNRS-SEQENS ZI de Limay 2 8 rue de Rouen 78440 Porcheville France
| | - Géraldine Masson
- Institut de Chimie des Substances Naturelles CNRS UPR 2301 Université Paris-Saclay 1, avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
- Labcom HITCAT joint lab CNRS-SEQENS ZI de Limay 2 8 rue de Rouen 78440 Porcheville France
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