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Jung E, Jeong Y, Kim H, Kim I. C3 Functionalization of Indolizines via HFIP-Promoted Friedel-Crafts Reactions with (Hetero)arylglyoxals. ACS OMEGA 2023; 8:16131-16144. [PMID: 37179639 PMCID: PMC10173336 DOI: 10.1021/acsomega.3c00236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 04/18/2023] [Indexed: 05/15/2023]
Abstract
A highly efficient Friedel-Crafts type hydroxyalkylation at the C3 position of indolizines with (hetero)arylglyoxals has been achieved by the action of hexafluoroisopropanol (HFIP) under mild reaction conditions, leading to direct access to a variety of polyfunctionalized indolizines in excellent yields. Installation of more diverse functional groups at the C3 site of indolizine scaffold was realized via further elaboration of the resulting α-hydroxyketone moiety, allowing for expansion of indolizine chemical space.
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Affiliation(s)
| | | | | | - Ikyon Kim
- . Tel: +82 32 749 4515. Fax: +82 32 749 4105
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Nam S, Lee S, Kim W, Kim I. Divergent synthesis of two types of indolizines from pyridine-2-acetonitrile, (hetero)arylglyoxal, and TMSCN. Org Biomol Chem 2023; 21:3881-3895. [PMID: 37097478 DOI: 10.1039/d3ob00471f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
Herein we describe the divergent synthesis of two types of indolizines via construction of the pyrrole moiety from pyridine-2-acetonitriles, arylglyoxals, and TMSCN. While one-pot three-component coupling provided 2-aryl-3-aminoindolizines via an unusual fragmentation process, a sequential two-step assembly protocol with these starting materials allowed efficient access to a wide range of new 2-acyl-3-aminoindolizines through an aldol condensation-Michael addition-cycloisomerization process. The subsequent manipulation of 2-acyl-3-aminoindolizines enabled direct access to novel polycyclic N-fused heteroaromatic skeletons.
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Affiliation(s)
- Seonghyeon Nam
- College of Pharmacy and Yonsei Institute of Pharmaceutical Sciences, Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon, 21983, Republic of Korea.
| | - Sunhee Lee
- College of Pharmacy and Yonsei Institute of Pharmaceutical Sciences, Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon, 21983, Republic of Korea.
| | - Woojin Kim
- College of Pharmacy and Yonsei Institute of Pharmaceutical Sciences, Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon, 21983, Republic of Korea.
| | - Ikyon Kim
- College of Pharmacy and Yonsei Institute of Pharmaceutical Sciences, Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon, 21983, Republic of Korea.
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Miao CB, Qiang XQ, Xu X, Song XQ, Zhou SQ, Lyu X, Yang HT. Synthesis of Stable N-H Imines with a Benzo[7,8]indolizine Core and Benzo[7,8]indolizino[1,2- c]quinolines via Copper-Catalyzed Annulation of α,β-Unsaturated O-Acyl Ketoximes with Isoquinolinium N-Ylides. Org Lett 2022; 24:3828-3833. [PMID: 35605016 DOI: 10.1021/acs.orglett.2c01386] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A copper-catalyzed annulation of α,β-unsaturated O-acyl ketoximes with isoquinolinium N-ylides has been developed for the concise synthesis of stable N-H imines with a benzo[7,8]indolizine core. When β-(2-bromoaryl)-α,β-unsaturated O-acyl ketoximes are used as the starting materials, a cascade cyclization occurs to afford the benzo[7,8]indolizino[1,2-c]quinolines.
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Affiliation(s)
- Chun-Bao Miao
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
| | - Xiao-Qi Qiang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
| | - Xiaoli Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
| | - Xiao-Qing Song
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
| | - Su-Qing Zhou
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
| | - Xinyu Lyu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
| | - Hai-Tao Yang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, School of Petrochemical Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
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Bedard N, Foley C, Davis GJ, Jewett JC, Hulme C. Sequential Knoevenagel [4+1] Cycloaddition-Condensation-Aza-Friedel-Crafts Intramolecular Cyclization: A 4-Center-3-Component Reaction Toward Tunable Fluorescent Indolizine Tetracycles. J Org Chem 2021; 86:17550-17559. [PMID: 34818017 DOI: 10.1021/acs.joc.1c01280] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A two-step multicomponent reaction oxidation protocol is reported herein, which affords novel tunable fluorescent tetracyclic indolizines. The procedure involves a novel 4-center-3-component reaction, which proceeds via a sequential Knoevenagel condensation, [4+1] cycloaddition, and imine condensation to afford imino-indolizines. Products then undergo cyclization and are oxidized in situ to afford fluorescent tetracycles, which are readily tunable through modification of diversity elements.
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Affiliation(s)
- Nathan Bedard
- Department of Chemistry & Biochemistry, College of Science, The University of Arizona, Tucson, Arizona 85721, United States
| | - Christopher Foley
- Department of Chemistry & Biochemistry, College of Science, The University of Arizona, Tucson, Arizona 85721, United States
| | - Garrett J Davis
- Department of Chemistry & Biochemistry, College of Science, The University of Arizona, Tucson, Arizona 85721, United States
| | - John C Jewett
- Department of Chemistry & Biochemistry, College of Science, The University of Arizona, Tucson, Arizona 85721, United States
| | - Christopher Hulme
- Department of Chemistry & Biochemistry, College of Science, The University of Arizona, Tucson, Arizona 85721, United States.,Department of Pharm./Tox., College of Pharmacy, The University of Arizona, Tucson, Arizona 85721, United States
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Sokolova EA, Festa AA, Subramani K, Rybakov VB, Varlamov AV, Voskressensky LG, Van der Eycken EV. Microwave-Assisted Synthesis of Fluorescent Pyrido[2,3- b]indolizines from Alkylpyridinium Salts and Enaminones. Molecules 2020; 25:E4059. [PMID: 32899473 PMCID: PMC7570714 DOI: 10.3390/molecules25184059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 08/24/2020] [Accepted: 09/03/2020] [Indexed: 11/17/2022] Open
Abstract
Pyridinium ylides are well recognized as dipoles for cycloaddition reactions. In its turn, the microwave-assisted interaction of N-(cyanomethyl)-2-alkylpyridinium salts with enaminones unexpectedly proceeds as a domino sequence of cycloisomerization and cyclocondensation reactions, instead of a 1,3-dipolar cycloaddition. The reaction takes place in the presence of sodium acetate as base and employs benign solvents. The optical properties of the resulting pyrido[2,3-b]indolizines were studied, showing green light emission with high fluorescence quantum yields.
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Affiliation(s)
- Ekaterina A. Sokolova
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Alexey A. Festa
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Karthikeyan Subramani
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Victor B. Rybakov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1–3, 119991 Moscow, Russia;
| | - Alexey V. Varlamov
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Leonid G. Voskressensky
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Erik V. Van der Eycken
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, University of Leuven (KU Leuven), Celestijnenlaan 200F, B-3001 Leuven, Belgium
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