1
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Aksenov DA, Smith JL, Aksenov AV, Prityko LA, Aksenov NA, Kuzminov IK, Aleksandrova EV, Sathish P, Mesa-Diaz N, Vernaza A, Zhang A, Du L, Kornienko A. 2-(3-Indolyl)acetamides and their oxazoline analogues: Anticancer SAR study. Bioorg Med Chem Lett 2024; 102:129681. [PMID: 38432288 DOI: 10.1016/j.bmcl.2024.129681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 02/21/2024] [Accepted: 02/28/2024] [Indexed: 03/05/2024]
Abstract
We previously studied 2-aryl-2-(3-indolyl)acetohydroxamates as potential agents against melanoma. These compounds were ineffective in a mouse melanoma xenograft model, most likely due to unfavorable metabolic properties, specifically due to glucuronidation of the N-hydroxyl of the hydoxamic moiety. In the present work, we prepared a series of analogues, 2-aryl-2-(3-indolyl)acetamides and their oxazoline derivatives, which do not contain the N-hydroxyl group. We investigated the structure-activity relationship in both series of compounds and found that the 2-naphthyl is a preferred group at C-2 of the indole in the amide series, whereas the tetralin moiety is favorable in the same location in the oxazoline series. Overall, three compounds in the amide series have GI50 values as low as 0.2-0.3 µM and the results clearly indicate that the N-hydroxyl group is not necessary for high potency in vitro.
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Affiliation(s)
- Dmitrii A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Jadyn L Smith
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Alexander V Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Lidiya A Prityko
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Nicolai A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Iliya K Kuzminov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Elena V Aleksandrova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Puppala Sathish
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Nakya Mesa-Diaz
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Alexandra Vernaza
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Angela Zhang
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Liqin Du
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Alexander Kornienko
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA.
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2
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Guo M, Zhang P, Li EQ. Recent Advances in Palladium-Catalyzed [4 + n] Cycloaddition of Lactones, Benzoxazinanones, Allylic Carbonates, and Vinyloxetanes. Top Curr Chem (Cham) 2023; 381:33. [PMID: 37921912 DOI: 10.1007/s41061-023-00442-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 10/06/2023] [Indexed: 11/05/2023]
Abstract
Palladium-catalyzed allylation cyclization reaction has recently emerged as an efficient and powerful synthetic platform for the construction of diverse and valuable carbo- and heterocycles. Thus the development of new allylic motifs for achieving this type of transformations in high reactivity and selectivity is of great importance. Generally, these substrates have been utilized as 1,3-, 1,4-, 1,5-, 1,6-dipoles in many reactions, which are applied to prepare highly functionalized products with complete control of chemo-, regio-, diastereo-, and enantioselectivity. In this review, we focus our attention on the development of palladium-catalyzed [4 + n] cycloaddition of allylic motifs and describe a comprehensive and impressive advances in this area. Meanwhile, the related mechanism and the application of these annulation strategies in natural product total synthesis will be highlighted in detail.
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Affiliation(s)
- Mengyan Guo
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Panke Zhang
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China.
| | - Er-Qing Li
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China.
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3
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Aksenov NA, Arutiunov NA, Kurenkov IA, Malyuga VV, Aksenov DA, Momotova DS, Zatsepilina AM, Chukanova EA, Leontiev AV, Aksenov AV. A Two-Step Synthesis of Unprotected 3-Aminoindoles via Post Functionalization with Nitrostyrene. Molecules 2023; 28:molecules28093657. [PMID: 37175067 PMCID: PMC10180116 DOI: 10.3390/molecules28093657] [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: 03/30/2023] [Revised: 04/19/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023] Open
Abstract
A novel, low-cost method for the preparation of not easily accessible free 3-aminoindoles has been developed. This approach is based on a well-established reaction between indoles and nitrostyrene in the presence of phosphorous acid, which results in the formation of 4'-phenyl-4'H-spiro[indole-3,5'-isoxazoles]. The latter could be transformed to corresponding aminated indoles by reaction with hydrazine hydrate in good or excellent yields upon microwave-assisted heating.
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Affiliation(s)
- Nicolai A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Nikolai A Arutiunov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Igor A Kurenkov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Vladimir V Malyuga
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Dmitrii A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Daria S Momotova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Anna M Zatsepilina
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Elizaveta A Chukanova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Alexander V Leontiev
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
| | - Alexander V Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355009 Stavropol, Russia
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4
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Aksenov AV, Kirilov NK, Arutiunov NA, Aksenov DA, Kuzminov IK, Aksenov NA, Turner DN, Rogelj S, Kornienko A, Rubin M. Reductive Cleavage of 4' H-Spiro[indole-3,5'-isoxazoles] En Route to 2-(1 H-Indol-3-yl)acetamides with Anticancer Activities. J Org Chem 2022; 87:13955-13964. [PMID: 36260110 DOI: 10.1021/acs.joc.2c01627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Unusual cascade transformation involving ring opening and 1,2-alkyl shift was observed upon the reduction of 4'H-spiro[indole-3,5'-isoxazoles] or 2-(3-oxoindolin-2-yl)acetonitriles with sodium borohydride. This reaction allowed for expeditious and highly efficient preparation of 2-(1H-Indol-3-yl)acetamides with antiproliferative properties.
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Affiliation(s)
- Alexander V Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Nikita K Kirilov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Nikolai A Arutiunov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Dmitrii A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Iliya K Kuzminov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Nicolai A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation
| | - Danielle N Turner
- Departments of Biology, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, United States
| | - Snezna Rogelj
- Departments of Biology, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, United States
| | - Alexander Kornienko
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
| | - Michael Rubin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russian Federation.,Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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5
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Aksenov AV, Arutiunov NA, Aksenov DA, Samovolov AV, Kurenkov IA, Aksenov NA, Aleksandrova EA, Momotova DS, Rubin M. A Convenient Way to Quinoxaline Derivatives through the Reaction of 2-(3-Oxoindolin-2-yl)-2-phenylacetonitriles with Benzene-1,2-diamines. Int J Mol Sci 2022; 23:ijms231911120. [PMID: 36232422 PMCID: PMC9570350 DOI: 10.3390/ijms231911120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/10/2022] [Accepted: 09/16/2022] [Indexed: 11/23/2022] Open
Abstract
Microwave-assisted reaction between 2-(3-oxoindolin-2-yl)-2-phenylacetonitriles andbenzene-1,2-diamines leads to the high-yielding formation of the corresponding quinoxalines as sole, easily isolaable products. The featured transformation involves unusual extrusion of phenylacetonitrile molecule and could be performed in a short sequence starting from commonly available indoles and nitroolefins.
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Affiliation(s)
- Alexander V. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
- Correspondence: (A.V.A.); (M.R.)
| | - Nikolai A. Arutiunov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
| | - Dmitrii A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
| | - Artem V. Samovolov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
| | - Igor A. Kurenkov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
| | - Nicolai A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
| | - Elena A. Aleksandrova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
| | - Daria S. Momotova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
| | - Michael Rubin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA
- Correspondence: (A.V.A.); (M.R.)
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6
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Aksenov AV, Aleksandrova EV, Aksenov DA, Aksenova AA, Aksenov NA, Nobi MA, Rubin M. Synthetic Studies toward 1,2,3,3a,4,8b-Hexahydropyrrolo[3,2- b]indole Core. Unusual Fragmentation with 1,2-Aryl Shift. J Org Chem 2022; 87:1434-1444. [PMID: 34990543 DOI: 10.1021/acs.joc.1c02753] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Base-assisted transformations of 2-(3-oxoindolin-2-yl)acetonitriles were investigated. Unexpectedly, attempted reactions of substrates possessing nonprotected nitrogen atoms were accompanied by unusual extrusions of 2-arylacetonitriles, followed by a 1,2-aryl shift to afford 3-hydroxyindolin-2-ones. On the other hand, the reactions for N-alkyl derivatives of oxoindolines took the expected route by only providing 1,2,3,3a,4,8b-hexahydropyrrolo[3,2-b]indoles.
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Affiliation(s)
- Alexander V Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russian Federation
| | - Elena V Aleksandrova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russian Federation
| | - Dmitrii A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russian Federation
| | - Anna A Aksenova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russian Federation
| | - Nicolai A Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russian Federation
| | - Mezvah A Nobi
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Michael Rubin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russian Federation.,Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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7
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Zhang Z, Jing L, Li E, Duan Z. Cooperative Palladium-Catalyzed and P(NEt2)3-Mediated (4+1) Annulation of Isatins with 2-Hydroxymethylallylcarbonates. Org Chem Front 2022. [DOI: 10.1039/d2qo00231k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
P(NR2)3-promoted transformations of isatins with electron-withdrawing alkenes have received consistently attention over the last decades. However, no example involving chemical transformations of nonactivated or weakly activated alkenes is discovered in...
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8
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Xu F, Smith MW. A general approach to 2,2-disubstituted indoxyls: total synthesis of brevianamide A and trigonoliimine C. Chem Sci 2021; 12:13756-13763. [PMID: 34760160 PMCID: PMC8549782 DOI: 10.1039/d1sc03533a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 09/15/2021] [Indexed: 12/11/2022] Open
Abstract
The indoxyl unit is a common structural motif in alkaloid natural products and bioactive compounds. Here, we report a general method that transforms readily available 2-substituted indoles into 2,2-disubstituted indoxyls via nucleophile coupling with a 2-alkoxyindoxyl intermediate and showcase its utility in short total syntheses of the alkaloids brevianamide A (7 steps) and trigonoliimine C (6 steps). The developed method is operationally simple and demonstrates broad scope in terms of nucleophile identity and indole substitution, tolerating 2-alkyl substituents and free indole N-H groups, elements beyond the scope of most prior approaches. Spirocyclic indoxyl products are also accessible via intramolecular nucleophilic trapping.
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Affiliation(s)
- Fan Xu
- Department of Biochemistry, UT Southwestern Medical Center 5323 Harry Hines Blvd Dallas Texas 75390 USA
| | - Myles W Smith
- Department of Biochemistry, UT Southwestern Medical Center 5323 Harry Hines Blvd Dallas Texas 75390 USA
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9
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Aksenov AV, Aksenov NA, Aleksandrova EV, Aksenov DA, Grishin IY, Sorokina EA, Wenger A, Rubin M. Direct Conversion of 3-(2-Nitroethyl)-1 H-Indoles into 2-(1 H-Indol-2-yl)Acetonitriles. Molecules 2021; 26:6132. [PMID: 34684712 PMCID: PMC8539596 DOI: 10.3390/molecules26206132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/07/2021] [Accepted: 10/09/2021] [Indexed: 11/17/2022] Open
Abstract
The recently discovered [4+1]-spirocyclization of nitroalkenes to indoles provided a convenient new approach to 2-(1H-indol-2-yl)acetonitriles. However, this reaction was complicated by the formation of inert 3-(2-nitroethyl)-1H-indole byproducts. Herein, we offer a workaround this problem that allows for effective transformation of the unwanted byproducts into acetonitrile target molecules.
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Affiliation(s)
- Alexander V. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (N.A.A.); (E.V.A.); (D.A.A.); (I.Y.G.)
| | - Nicolai A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (N.A.A.); (E.V.A.); (D.A.A.); (I.Y.G.)
| | - Elena V. Aleksandrova
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (N.A.A.); (E.V.A.); (D.A.A.); (I.Y.G.)
| | - Dmitrii A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (N.A.A.); (E.V.A.); (D.A.A.); (I.Y.G.)
| | - Igor Yu. Grishin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (N.A.A.); (E.V.A.); (D.A.A.); (I.Y.G.)
| | - Elena A. Sorokina
- Organic Chemistry Department, Peoples’ Friendship University of Russia (RUDN University), 6, Miklukho-Maklaya St., 117198 Moscow, Russia;
| | - Allison Wenger
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA;
| | - Michael Rubin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (N.A.A.); (E.V.A.); (D.A.A.); (I.Y.G.)
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA;
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10
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Aksenov AV, Arutiunov NA, Kirilov NK, Aksenov DA, Grishin IY, Aksenov NA, Wang H, Du L, Betancourt T, Pelly SC, Kornienko A, Rubin M. [3 + 2]-Annulation of pyridinium ylides with 1-chloro-2-nitrostyrenes unveils a tubulin polymerization inhibitor. Org Biomol Chem 2021; 19:7234-7245. [PMID: 34387294 PMCID: PMC8439629 DOI: 10.1039/d1ob01141c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Indolizines and pyrazolo[1,5-a]pyridines were prepared via [3 + 2]-cycloaddition of pyridinium ylides to 1-chloro-2-nitrostyrenes. The synthesized molecules were evaluated for antiproliferative activities against a BE(2)-C neuroblastoma cell line with several compounds decreasing the viability of cancer cells. Indolizine 9db showed higher potency than that of all-trans-retinoic acid, an approved cancer drug. Mechanistically, it was found to inhibit tubulin polymerization and it is thus proposed that the discovered chemistry can be exploited for the development of novel microtubule-targeting anticancer agents.
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Affiliation(s)
- Alexander V Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russia.
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11
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Li Y, Jie J, Li H, Yang H, Fu H. Synthesis of Spirotetrahydrofuran Oxindoles via Palladium-Catalyzed [4 + 1] Cycloaddition of Diphenyl 2-Oxoindolin-3-yl Phosphates and 2-Methylidenetrimethylene Carbonate. Org Lett 2021; 23:6499-6503. [PMID: 34342464 DOI: 10.1021/acs.orglett.1c02306] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel palladium-catalyzed [4 + 1] cycloaddition to give spirotetrahydrofuran oxindoles has been developed, in which diphenyl 2-oxoindolin-3-yl phosphates were used as the both electrophilic and nucleophilic C1 synthons at C-3 of the oxindole unit and 2-methylidenetrimethylene carbonate was used as the 1,4-dipole. The cycloannulation was performed at room temperature and provided the corresponding spirotetrahydrofuran oxindoles in good to excellent yields. The present method affords a new strategy for the construction of spirooxindole derivatives with unique three-dimensional structures.
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Affiliation(s)
- Yuming Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Jiyang Jie
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Hongyun Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Haijun Yang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Hua Fu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China
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12
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Aksenov AV, Aksenov DA, Aksenov NA, Skomorokhov AA, Aleksandrova EV, Rubin M. Preparation of spiro[indole-3,5′-isoxazoles] via Grignard conjugate addition/spirocyclization sequence. RSC Adv 2021; 11:1783-1793. [PMID: 35424118 PMCID: PMC8693578 DOI: 10.1039/d0ra10219a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 12/21/2020] [Indexed: 12/25/2022] Open
Abstract
A highly efficient one-pot procedure combining conjugate addition of Grignard reagents to (2-nitroalkenyl)indoles and sub-sequent Brønsted acid-assisted spirocyclization allowed for preparation of 4′H-spiro[indole-3,5′-isoxazoles] in a diastereomerically selective fashion. Utilization of alkyl Grignard reagents provided an easy access to 4′-alkylsubstituted derivatives hardly available by other means. One-pot procedure combining conjugate addition of Grignard reagents to (2-nitroalkenyl)indoles and subsequent acid-assisted spirocyclization allowed for diastereoselective preparation of 4′H-spiro[indole-3,5′-isoxazoles].![]()
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Affiliation(s)
- Alexander V. Aksenov
- Department of Chemistry
- North Caucasus Federal University
- Stavropol 355009
- Russian Federation
| | - Dmitrii A. Aksenov
- Department of Chemistry
- North Caucasus Federal University
- Stavropol 355009
- Russian Federation
| | - Nicolai A. Aksenov
- Department of Chemistry
- North Caucasus Federal University
- Stavropol 355009
- Russian Federation
| | - Anton A. Skomorokhov
- Department of Chemistry
- North Caucasus Federal University
- Stavropol 355009
- Russian Federation
| | - Elena V. Aleksandrova
- Department of Chemistry
- North Caucasus Federal University
- Stavropol 355009
- Russian Federation
| | - Michael Rubin
- Department of Chemistry
- North Caucasus Federal University
- Stavropol 355009
- Russian Federation
- Department of Chemistry
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13
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Rajesh M, Kumar R, Puri S, Nanubolu JB, Reddy MS. Lewis-Acid-Catalyzed Decarboxylative Annulation of 2-Aminoindole-3-Carboxylate with Ynals Involving [3 + 2] Spirocycloaddition and 2,3-Aza Migration. Org Lett 2020; 22:1117-1123. [DOI: 10.1021/acs.orglett.9b04626] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Manda Rajesh
- Department of OSPC, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
- Academy of Scientific and Innovative Research, New Delhi, India
| | | | | | | | - Maddi Sridhar Reddy
- Department of OSPC, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
- Academy of Scientific and Innovative Research, New Delhi, India
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