1
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Tokushige K, Abe T. Formal One Carbon Deletion of Indoline Hemiaminals under Tautomeric Control to Access 2-Aminobenzyl Compounds. J Org Chem 2024. [PMID: 38949244 DOI: 10.1021/acs.joc.4c00884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
Unprecedented tert-BuOK-mediated one carbon deletion of indoline hemiaminals has been achieved. This novel protocol provides an efficient synthetic tool for the construction of 2-aminobenzyl compounds with high chemoselectivity. In addition, functionalized 2-aminobenzyl compounds are difficult to make, for which few limited means of access currently exist. The key to success is the use of in situ generated Heyns rearrangement products (α-amino carbonyl compounds) as precursors for formal one carbon deletion.
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Affiliation(s)
- Keisuke Tokushige
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
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2
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Yamashiro T, Abe T. Switchable synthesis of 3-aminoindolines and 2'-aminoarylacetic acids using Grignard reagents and 3-azido-2-hydroxyindolines. Chem Commun (Camb) 2024; 60:6615-6618. [PMID: 38847113 DOI: 10.1039/d4cc01448k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
The switchable synthesis of 3-aminoindolines and 2'-aminoaryl acetic acids from the same substrates, 3-azido-2-hydroxyindolines, was developed through denitrogenative electrophilic amination of Grignard reagents. The key to success is the serendipitous discovery that the reaction conditions, including solvents and reaction temperature, can affect the chemoselectivity. It is noteworthy that isotope-labeling experiments revealed the occurrence of the aziridine intermediate in the production of 2'-aminoaryl acetic acids.
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Affiliation(s)
- Toshiki Yamashiro
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
| | - Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
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3
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Abe T. Synthetic strategies for the construction of C3-N1' bisindoles. Org Biomol Chem 2024; 22:1756-1764. [PMID: 38319400 DOI: 10.1039/d3ob02089d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
C3-N1' bisindoles are unique structures, and the construction of these structures has drawn much attention. However, their synthesis still presents significant challenges that limit the functional group compatibility. This minireview summarizes the recent progress in the methodology for constructing C3-N1' bisindoles. There are two approaches for access to C3-N1' bisindoles: (1) direct approaches including reverse polarity techniques. (2) Stepwise approaches using designed and prefunctionalized substrates enable further functionalization by additional reactions to facilitate access to the target products. I believe that this review will allow its readers to develop novel approaches for the synthesis of C3-N1' bisindoles.
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Affiliation(s)
- Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
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4
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Tokushige K, Abe T. On Demand Synthesis of C3-N1' Bisindoles by a Formal Umpolung Strategy: First Total Synthesis of (±)-Rivularin A. Chemistry 2024; 30:e202302963. [PMID: 37988219 DOI: 10.1002/chem.202302963] [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: 09/12/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 11/23/2023]
Abstract
In this work, a straightforward synthesis of C3-N1' bisindolines is achieved by a formal umpolung strategy. The protocols were tolerant of a wide variety of substituents on the indole and indoline ring. In addition, the C3-N1' bisindolines could be converted to C3-N1' indole-indolines and C3-N1'-bisindoles. Also, we have successfully synthesized (±)-rivularin A through a biomimetic late-stage tribromination as a key step.
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Affiliation(s)
- Keisuke Tokushige
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama, 7008530, Japan
| | - Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama, 7008530, Japan
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5
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Camara VS, da Silva AL, da Luz LC, Rodembusch FS, Santiago PHO, Ellena J, Burtoloso ACB. Unveiling a Strategy for Ring Opening of Epoxides: Synthesis of 2-Hydroxyindolinylidenes Using α-Ester Sulfoxonium Ylides. Org Lett 2024; 26:1034-1039. [PMID: 38286095 DOI: 10.1021/acs.orglett.3c04169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
The untapped potential of α-carbonyl sulfoxonium ylides in epoxide ring-opening reactions has been a notable gap in current research, with such reactivity predominantly associated with the highly reactive dimethylsulfoxonium methylide. This study introduces an innovative approach wherein an epoxide indole, formed in situ from 2-hydroxyindoline-3-triethylammonium bromide, undergoes reaction with α-ester sulfoxonium ylides. The outcome is the efficient synthesis of a range of 2-hydroxyindolin-3-ylidenes, demonstrating favorable yields (41-81%) and Z/E ratios from 4:1 to those of exclusive Z isomers. Additionally, the photophysical properties of the synthesized indolinylidenes are explored, along with their derivatization using various nucleophiles under acid catalysis.
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Affiliation(s)
- Viktor S Camara
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Aislan L da Silva
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Lilian C da Luz
- Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
| | - Fabiano S Rodembusch
- Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
| | - Pedro H O Santiago
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Javier Ellena
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Antonio C B Burtoloso
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP 13560-970, Brazil
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6
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Aluminum-Catalyzed Cross Selective C3–N1′ Coupling Reactions of N-Methoxyindoles with Indoles. CHEMISTRY 2023. [DOI: 10.3390/chemistry5010033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023] Open
Abstract
C3–N1′ bond formation of bisindoles has been a great challenge due to the intrinsic reactivity of indoles as both C3 and N1-nucleophilic character. Herein, we demonstrate an C3–N1′ cross-coupling reaction of indoles using N-methoxyindoles as N-electrophilic indole reagents in the presence of Lewis acid. The bisindoles generated in this transformation are latent C3-nucleophile, allowing them to be used as strategic intermediates in sequential C3–N1′–C3′–N1″ triindole formations. The potential synthetic usefulness of this sequential transformation was highlighted upon application to the construction of C3–N1 looped polyindoles.
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7
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Yamada K, Ohta M, Kitamura G, Tsutsumiguchi S, Nishi T. Facile synthesis of indole 3-acetic acid and azaindole 3-acetic acid derivatives. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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8
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Zhang Z, Yuan C, Xun MM, Fu K. Crystal structure of 2-hydroxy-1-tosylindolin-3-yl- 2-naphthoate, C 26H 21N 1S 1O 5. Z KRIST-NEW CRYST ST 2022. [DOI: 10.1515/ncrs-2022-0452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Abstract
C26H21N1S1O5, monoclinic, P21/c (no. 14), a = 7.623(3) Å, b = 25.617(12) Å, c = 11.775(5) Å, β = 100.073(8)°, V = 2264.2(17) Å3, Z = 4, R
gt
(F) = 0.0470, wR
ref
(F
2) = 0.1365, T = 298(2) K.
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Affiliation(s)
- Zhenguo Zhang
- School of Chemical Engineering and Technology, North University of China , Taiyuan , Shanxi Province , P. R. China
| | - Changchun Yuan
- School of Chemical Engineering and Technology, North University of China , Taiyuan , Shanxi Province , P. R. China
| | - Miao-Miao Xun
- School of Chemical Engineering and Technology, North University of China , Taiyuan , Shanxi Province , P. R. China
| | - Kai Fu
- School of Chemical Engineering and Technology, North University of China , Taiyuan , Shanxi Province , P. R. China
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9
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Yu L, Huang S, Cai T, Du K, Wu C, Dong H, Shen R. Diastereoselective Access to Triazolo[1,2- a]indolines via a Bio-Inspired Oxidative Cyclization of NH-Indoles. J Org Chem 2022; 87:15114-15119. [PMID: 36201282 DOI: 10.1021/acs.joc.2c01593] [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
Establishing three-dimensional chemicals by using the C2-C3 π bond of indoles has always been a research hotspot in organic synthesis; however, employing the oxidative C2-C3 π bond of indoles to generate imine which would lead to the N1-C2 π bond cyclization under metal-free conditions is still rare. Here, we report a bio-inspired synthesis of triazolo[1,2-a]indolines by the oxidative cyclization between NH-indoles and azomethine imines with 3,3-dimethyldioxirane as the sole oxidant under metal-free and mild conditions. This finding represents an elegant instance of tri-functionalization of NH-indoles, which provides rapid access to a broad range of triazolo[1,2-a]indolines with tetrahydroisoquinolines in one single step. Up to 86% yield and above 20:1 dr value are observed. The radical mechanism and proton migration process have been speculated.
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Affiliation(s)
- Lemao Yu
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing312000, China
| | - Senhao Huang
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing312000, China
| | - Tao Cai
- Zhejiang Engineering Research Center of Fat-Soluble Vitamin, Shaoxing312000, China
| | - Kui Du
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing312000, China
| | - Chunlei Wu
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing312000, China
| | - Huaping Dong
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing312000, China
| | - Runpu Shen
- Zhejiang Engineering Research Center of Fat-Soluble Vitamin, Shaoxing312000, China
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10
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Nishi T, Fukuya R, Yamada K. Practical Synthesis of 7-Azaserotonin and 7-Azamelatonin. Synlett 2022. [DOI: 10.1055/s-0041-1738758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
AbstractA practical method for synthesizing 7-azaserotonin and 7-azamelatonin was developed by using 3-bromo-5-methoxy-1-tosyl-2,3-dihydro-1H-pyrrolo[2,3-b]pyridin-2-ol as a starting material. This compound is a useful reactant for the formal C3-electrophilic reaction. The lactone derivative obtained by the reaction with Meldrum’s acid was used as a key intermediate, in which the C2 unit was introduced into the 7-azaindole skeleton.
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11
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Abe T, Nakajima R, Yamashiro T, Sawada D. First Total Synthesis of Reassigned Echinosulfonic Acid D. JOURNAL OF NATURAL PRODUCTS 2022; 85:2122-2125. [PMID: 35976728 DOI: 10.1021/acs.jnatprod.2c00559] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Echinosulfonic acid D, a sponge metabolite whose structure was recently reassigned, was synthesized for the first time. The key step is the double indolization of dimethylbarbituric acid using the umpolung indole reagent, followed by a hydrolysis/decarboxylation/esterification sequence.
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Affiliation(s)
- Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Ren Nakajima
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Toshiki Yamashiro
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Daisuke Sawada
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
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12
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Abe T, Yamashiro T, Shimizu K, Sawada D. Indole Editing Enabled by HFIP-Mediated Ring-Switch Reactions of 3-Amino-2-Hydroxyindolines. Chemistry 2022; 28:e202201113. [PMID: 35438809 DOI: 10.1002/chem.202201113] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Indexed: 12/26/2022]
Abstract
This work reports the novel reactivity of hemiaminal as a precursor for indole editing at the multi-site. The HFIP-promoted indole editing of indoline hemiaminals affords 2-arylindoles through a ring-switch sequence. The key to success of this transformation is to use a cyclic hemiaminal as an α-amino aldehyde surrogate under transient tautomeric control. This transformation features mild reaction conditions and good yields with broad functional group tolerance. The utility of this transformation is presented through the one-pot protocol and the synthesis of isocryptolepine.
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Affiliation(s)
- Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama, 7008530, Japan
| | - Toshiki Yamashiro
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama, 7008530, Japan
| | - Kaho Shimizu
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama, 7008530, Japan
| | - Daisuke Sawada
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama, 7008530, Japan
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13
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Kimura R, Sato Y, Morisaki K, Nishi T. [3 + 2] cycloaddition of 1-(4-Methoxybenzyl)indoles and azaindoles with nitrile oxides. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Yamashiro T, Abe T, Sawada D. Synthesis of 2-monosubstituted indolin-3-ones by cine-substitution of 3-azido-2-methoxyindolines. Org Chem Front 2022. [DOI: 10.1039/d2qo00048b] [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
We report herein the formal cine-substitution/hydrolysis of 3-azidoindole intermediates generated from 3-azido-2-methoxyindolines (AZINs). This protocol enables the introduction of both various carboxylic acid and alcohol into indolin-3-ones at the C2-position,...
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15
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Yamashiro T, Abe T, Tanioka M, Kamino S, Sawada D. cis-3-Azido-2-methoxyindolines as safe and stable precursors to overcome the instability of fleeting 3-azidoindoles. Chem Commun (Camb) 2021; 57:13381-13384. [PMID: 34821884 DOI: 10.1039/d1cc06033c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Use of 3-azidoindoles in organic synthesis remains a difficult task owing to their instabilities. Herein, we report a general and concise approach for tackling this problem by using 3-azidoindole surrogates. The surrogates are bench-stable, presumably due to the observed intramolecular O-Nβ bonding. The resultant fleeting intermediates undergo capturing in situ to afford 3-substitued indoles through formal ipso-substitution of the azide group by nucleophiles. In these investigations, we found that the fleeting 3-azidoindoles show a C3-electrophilic character for the first time.
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Affiliation(s)
- Toshiki Yamashiro
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
| | - Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
| | - Masaru Tanioka
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, 4648650, Japan
| | - Shinichiro Kamino
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, 4648650, Japan
| | - Daisuke Sawada
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
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16
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Yang XP, Lv HP, Yang HD, Wang BL, Wang XW. Box-copper catalyzed cascade asymmetric amidation for chiral exo-methylene aminoindoline derivatives. Org Biomol Chem 2021; 19:9373-9378. [PMID: 34673876 DOI: 10.1039/d1ob01242h] [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
Enantioselective copper-catalyzed cascade inter- and intramolecular amidation was achieved between ethynyl benzoxazinanones and α-halohydroxamates in the presence of an indapybox ligand. The one-pot cascade transformation was triggered by the attack of hydroxamates to dipolar copper-allenylidene intermediates, followed by a nucleophilic annulation reaction. Thus, a series of exo-methylene 3-aminoindoline derivatives were obtained in good yields with high enantioselectivities under mild reaction conditions.
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Affiliation(s)
- Xiao-Peng Yang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
| | - Hao-Peng Lv
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
| | - Hao-Di Yang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
| | - Bai-Lin Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
| | - Xing-Wang Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
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17
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Yamada K, Mishima N, Saito K, Nishi T. Synthesis and applications of 3-bromo-2-hydroxy-1-tosylazaindolines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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18
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Abe T, Noda K, Sawada D. Synthesis of α-substituted indolylacetamide using acetonitriles as acetamide enolate equivalents through O-transfer reactions. Chem Commun (Camb) 2021; 57:7493-7496. [PMID: 34212954 DOI: 10.1039/d1cc02821a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We introduce readily available ammonium hemiaminals as O-transfer reagents and commercially available acetonitriles as a primary amide enolate precursor. The combination serves as an amide enolate equivalent, thereby providing one-pot access to α-substituted indolylacetamides. A broad substrate scope and good functional group tolerance as well as gram-scale synthesis make this protocol highly attractive. Mechanistic experiments suggest that the cyano group is trapped by a hydroxy group of hemiaminals en route to the desired primary amides under metal-free conditions.
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Affiliation(s)
- Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
| | - Kenta Noda
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
| | - Daisuke Sawada
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan.
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19
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Abe T, Hirao S. Rapid access to indole-fused bicyclo[2.2.2]octanones by merging the umpolung strategy and molecular iodine as a green catalyst. Org Biomol Chem 2021; 18:4193-4197. [PMID: 32458925 DOI: 10.1039/d0ob01038c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-pot synthesis of indole-fused bicyclo[2.2.2]octanones from DiMeOIN and 2-cyclohexen-1-one is accomplished under an iodine catalyst. The simple and metal-free conditions provide a practical tool to construct Csp3-rich complex molecules via coupling cyclization.
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Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan.
| | - Seiya Hirao
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan.
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20
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Chen YJ, Liu H, Zhang SY, Li H, Ma KY, Liu YQ, Yin XD, Zhou R, Yan YF, Wang RX, He YH, Chu QR, Tang C. Design, Synthesis, and Antifungal Evaluation of Cryptolepine Derivatives against Phytopathogenic Fungi. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:1259-1271. [PMID: 33496176 DOI: 10.1021/acs.jafc.0c06480] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Inspired by the widely antiphytopathogenic application of diversified derivatives from natural sources, cryptolepine and its derivatives were subsequently designed, synthesized, and evaluated for their antifungal activities against four agriculturally important fungi Rhizoctonia solani, Botrytis cinerea, Fusarium graminearum, and Sclerotinia sclerotiorum. The results obtained from in vitro assay indicated that compounds a1-a24 showed great fungicidal property against B. cinerea (EC50 < 4 μg/mL); especially, a3 presented significantly prominent inhibitory activity with an EC50 of 0.027 μg/mL. In the pursuit of further expanding the antifungal spectrum of cryptolepine, ring-opened compound f1 produced better activity with an EC50 of 3.632 μg/mL against R. solani and an EC50 of 5.599 μg/mL against F. graminearum. Furthermore, a3 was selected to be a candidate to investigate its preliminary antifungal mechanism to B. cinerea, revealing that not only spore germination was effectively inhibited and the normal physiological structure of mycelium was severely undermined but also detrimental reactive oxygen was obviously accumulated and the normal function of the nucleus was fairly disordered. Besides, in vivo curative experiment against B. cinerea found that the therapeutic action of a3 was comparable to that of the positive control azoxystrobin. These results suggested that compound a3 could be regarded as a novel and promising agent against B. cinerea for its valuable potency.
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Affiliation(s)
- Yong-Jia Chen
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Hua Liu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Shao-Yong Zhang
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, College of Life Science, Huzhou University, Huzhou 313000, China
| | - Hu Li
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Kun-Yuan Ma
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Ying-Qian Liu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Xiao-Dan Yin
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Rui Zhou
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Yin-Fang Yan
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Ren-Xuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Ying-Hui He
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Qing-Ru Chu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Chen Tang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China
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21
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Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
| | - Koji Yamada
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
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22
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Abe T, Kosaka Y, Kawasaki T, Ohata Y, Yamashiro T, Yamada K. Revisiting 2-Alkoxy-3-bromoindolines: Control C-2 vs. C-3 Elimination for Regioselective Synthesis of Alkoxyindoles. Chem Pharm Bull (Tokyo) 2020; 68:555-558. [DOI: 10.1248/cpb.c20-00135] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
| | - Yuta Kosaka
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
| | - Takaaki Kawasaki
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
| | - Yuki Ohata
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
| | - Toshiki Yamashiro
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
| | - Koji Yamada
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido
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23
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Wakuluk-Machado AM, Dewez DF, Baguia H, Imbratta M, Echeverria PG, Evano G. Pd(OH) 2/C, a Practical and Efficient Catalyst for the Carboxylation of Benzylic Bromides with Carbon Monoxide. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.9b00402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anne-Marie Wakuluk-Machado
- Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles, Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Damien F. Dewez
- Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles, Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Hajar Baguia
- Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles, Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
| | - Miguel Imbratta
- Minakem Recherche, 145 Chemin des Lilas, 59310 Beuvry-la-Forêt, France
| | | | - Gwilherm Evano
- Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles, Avenue F. D. Roosevelt 50, CP160/06, 1050 Brussels, Belgium
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24
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Luo M, Zhu X, Liu R, Yu S, Wei W. FeCl3-Promoted Annulation of 2-Haloindoles: Switchable Synthesis of Spirooxindole-chromeno[2,3-b]indoles and Spirooxindole-chromeno[3,2-b]indoles. J Org Chem 2020; 85:3638-3654. [DOI: 10.1021/acs.joc.9b03300] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Mupeng Luo
- School of Life Science and Technology (SLST), ShanghaiTech University, 100 Haike Road, Shanghai 201210, China
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, 99 Haike Road, Shanghai 201210, China
| | - Xinlei Zhu
- Ammoxidation Business Unit Shanghai R&D Center, Anshan Hifichem Company, Ltd., Shanghai 201100, China
| | - Rufeng Liu
- Ammoxidation Business Unit Shanghai R&D Center, Anshan Hifichem Company, Ltd., Shanghai 201100, China
| | - Shunming Yu
- Ammoxidation Business Unit Shanghai R&D Center, Anshan Hifichem Company, Ltd., Shanghai 201100, China
| | - Wanguo Wei
- School of Life Science and Technology (SLST), ShanghaiTech University, 100 Haike Road, Shanghai 201210, China
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, 99 Haike Road, Shanghai 201210, China
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25
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Abe T, Hirao S, Yamashiro T. A metal-, oxidant-, and fluorous solvent-free synthesis of α-indolylketones enabled by an umpolung strategy. Chem Commun (Camb) 2020; 56:10183-10186. [DOI: 10.1039/d0cc04795c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We have developed the first transition metal-, oxidant-, and fluorous solvent-free α-indolization of ketones using ammonium salts and enamines.
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Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Japan
| | - Seiya Hirao
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Japan
| | - Toshiki Yamashiro
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Japan
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26
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Abe T, Hirao S, Kitamori M, Itoh T, Chiba Y. A Mild Bischler–Napieralski-Type Cyclization of Trichloromethyl Carbamates for the Synthesis of β-Carbolinones. HETEROCYCLES 2020. [DOI: 10.3987/com-19-s(f)19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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27
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Hirao S, Yamashiro T, Kohira K, Mishima N, Abe T. 2,3-Dimethoxyindolines: a latent electrophile for SNAr reactions triggered by indium catalysts. Chem Commun (Camb) 2020; 56:5139-5142. [DOI: 10.1039/d0cc01210f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An unprecedented utilization of 2,3-dimethoxyindolines (DiMeOINs) as a latent electrophile in regioselective In-catalyzed aromatic substitutions has been reported.
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Affiliation(s)
- Seiya Hirao
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Hokkaido 0610293
- Japan
| | - Toshiki Yamashiro
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Hokkaido 0610293
- Japan
| | - Kyouka Kohira
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Hokkaido 0610293
- Japan
| | - Naoki Mishima
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Hokkaido 0610293
- Japan
| | - Takumi Abe
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-tobetsu
- Hokkaido 0610293
- Japan
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28
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Li Y, Guo J, Lu X, Zhong F. One-step assembly of alkoxypyrroloindolines via iodine-catalyzed alkoxycyclization of indole derivatives. Org Biomol Chem 2019; 18:32-35. [PMID: 31761916 DOI: 10.1039/c9ob02287b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we report an iodine-catalyzed alkoxycyclization of tryptamine derivatives under mild reaction conditions. This method distinguished itself by providing a catalytic, one-step assembly of diversely functionalized C3a-alkoxypyrroloindolines as well as dihydrofuran and lactone fused indolines. Mechanistic studies suggest that an ionic pathway is operative and this probably accounts for the diastereospecificity of all isolated cycloadducts.
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Affiliation(s)
- Yan Li
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu road, Wuhan 430074, China.
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29
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Abe T, Aoyama S, Ohmura M, Taniguchi M, Yamada K. Revisiting Furodiindolines: One-Pot Synthesis of Furodiindolines Using Indole 2,3-Epoxide Surrogates and Their Synthetic Applications. Org Lett 2019; 21:3367-3371. [PMID: 30997809 DOI: 10.1021/acs.orglett.9b01108] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Furodiindolines have emerged as versatile intermediates in various transformations, which are easily obtained from indole 2,3-epoxide surrogates via a one-pot procedure and allowed access to heterocyclic compounds with structural diversity and complexity. Four types of transformations from the furodiindolines have been achieved: (i) dehydrative rearrangement to afford 2,3'-biindoles, (ii) hydrolysis/cyclization to give 3,4-disubstituted quinolines, (iii) ring-opening/cyclization to give pyrroloindolines, and (iv) aminal cleavage to give a 3,3-disubstituted 2-oxindole.
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Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences , Health Sciences University of Hokkaido , Ishikari-tobetsu, Hokkaido 0610293 , Japan
| | - Sakura Aoyama
- Faculty of Pharmaceutical Sciences , Health Sciences University of Hokkaido , Ishikari-tobetsu, Hokkaido 0610293 , Japan
| | - Masami Ohmura
- Faculty of Pharmaceutical Sciences , Health Sciences University of Hokkaido , Ishikari-tobetsu, Hokkaido 0610293 , Japan
| | - Masato Taniguchi
- Faculty of Pharmaceutical Sciences , Health Sciences University of Hokkaido , Ishikari-tobetsu, Hokkaido 0610293 , Japan
| | - Koji Yamada
- Faculty of Pharmaceutical Sciences , Health Sciences University of Hokkaido , Ishikari-tobetsu, Hokkaido 0610293 , Japan
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30
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Abe T, Kosaka Y, Asano M, Harasawa N, Mishina A, Nagasue M, Sugimoto Y, Katakawa K, Sueki S, Anada M, Yamada K. Direct C4-Benzylation of Indoles via Tandem Benzyl Claisen/Cope Rearrangements. Org Lett 2019; 21:826-829. [DOI: 10.1021/acs.orglett.8b04120] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
| | - Yuta Kosaka
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
| | - Miku Asano
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
| | - Natsuki Harasawa
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
| | - Akane Mishina
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
| | - Misato Nagasue
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
| | - Yuri Sugimoto
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
| | - Kazuaki Katakawa
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi 202-8585, Japan
| | - Shunsuke Sueki
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi 202-8585, Japan
| | - Masahiro Anada
- Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi 202-8585, Japan
| | - Koji Yamada
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 061-0293, Japan
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31
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32
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Itoh T, Chiba Y, Kawaguchi S, Koitaya Y, Yoneta Y, Yamada K, Abe T. Total synthesis of pyrano[3,2- e]indole alkaloid fontanesine B by a double cyclization strategy. RSC Adv 2019; 9:10420-10424. [PMID: 35520921 PMCID: PMC9062488 DOI: 10.1039/c9ra02321f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 03/27/2019] [Indexed: 12/01/2022] Open
Abstract
The regioselective synthesis of pyrano[3,2-e]indole alkaloid fontanesine B by two different cyclizations is described. The complete regioselectivity is controlled by the C4 Pictet–Spengler cyclization, in which an iminium ion acts as a transient directing (TDG) group. Furthermore, carbolines were constructed by a new Bischler–Napieralski-type cyclization, in which an unprecedented trichloromethyl carbamate serves as a reactive group. The regioselective synthesis of pyrano[3,2-e]indole alkaloid fontanesine B have been accomplished by C4 Pictet–Spengler cyclization and Bischler–Napieralski-type cyclization of a trichloromethyl carbamate.![]()
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Affiliation(s)
- Tomoki Itoh
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Hokkaido 0610293
- Japan
| | - Yuusuke Chiba
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Hokkaido 0610293
- Japan
| | - Shunsuke Kawaguchi
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Hokkaido 0610293
- Japan
| | - Yuki Koitaya
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Hokkaido 0610293
- Japan
| | - Yuuma Yoneta
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Hokkaido 0610293
- Japan
| | - Koji Yamada
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Hokkaido 0610293
- Japan
| | - Takumi Abe
- Faculty of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Hokkaido 0610293
- Japan
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33
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Tang M, Chu B, Chang X. Direct N-Alkylation and Kemp Elimination Reactions of 1-Sulfonyl-1H-Indazoles. Chem Asian J 2018; 13:2109-2116. [PMID: 30020558 DOI: 10.1002/asia.201800741] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 06/05/2018] [Indexed: 02/28/2024]
Abstract
The reactions of 1-sulfonyl-1H-indazoles under basic conditions are discussed, and the direct N-alkylation and Kemp elimination reactions of these compounds are reported. A series of 2-(p-tosylamino)benzonitriles and N-alkyl indazoles were prepared in good yields. Moreover, the 2-(p-tosylamino)benzonitriles could be transformed into a diverse range of important derivatives in a one-pot reaction. This method was successfully applied to the total syntheses of quindolinone and cryptolepinone; quindolinone was prepared in a one-pot reaction from 1-sulfonyl-1H-indazole.
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Affiliation(s)
- Meng Tang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Bingjie Chu
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Xiaowei Chang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, P. R. China
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34
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Abe T, Shimizu H, Takada S, Tanaka T, Yoshikawa M, Yamada K. Double “Open and Shut” Transformation of γ-Carbolines Triggered by Ammonium Salts: One-Pot Synthesis of Multiheterocyclic Compounds. Org Lett 2018; 20:1589-1592. [DOI: 10.1021/acs.orglett.8b00332] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Haruka Shimizu
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Shiori Takada
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Takahiro Tanaka
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Mai Yoshikawa
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Koji Yamada
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
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35
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Abe T, Yamada K. Dehydrative Mannich-Type Reaction for the Synthesis of Azepinobisindole Alkaloid Iheyamine A. Org Lett 2018; 20:1469-1472. [DOI: 10.1021/acs.orglett.8b00330] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical
Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Koji Yamada
- Faculty of Pharmaceutical
Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
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36
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Abstract
This review discusses various biological and chemical aspects of the non-monoterpenoid azepinoindole class of alkaloids, including their isolation, biosynthesis and total synthesis.
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Affiliation(s)
- Ashley C. Lindsay
- School of Chemical Sciences
- University of Auckland
- Auckland
- New Zealand
| | - Se Hun Kim
- School of Chemical Sciences
- University of Auckland
- Auckland
- New Zealand
| | - Jonathan Sperry
- School of Chemical Sciences
- University of Auckland
- Auckland
- New Zealand
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37
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Ivanov KL, Vatsouro IM, Bezzubov SI, Melnikov MY, Budynina EM. Domino construction of a bullataketal core via double bond cleavage in activated dihydrofurans. Org Chem Front 2018. [DOI: 10.1039/c8qo00132d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A new rapid approach to structurally challenging and biologically relevant methanobenzodioxepines was developed via a Brønsted acid-triggered domino transformation of 3-carbonyl-4,5-dihydrofurans, substituted with MOM-protected o-hydroxyaryls at the C4 atom.
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Affiliation(s)
| | - Ivan M. Vatsouro
- Department of Chemistry
- Lomonosov Moscow State University
- Moscow 119991
- Russia
| | - Stanislav I. Bezzubov
- Kurnakov Institute of General and Inorganic Chemistry
- Russian Academy of Sciences
- Moscow 119991
- Russia
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38
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Nandi RK, Perez-Luna A, Gori D, Beaud R, Guillot R, Kouklovsky C, Gandon V, Vincent G. Triflic Acid as an Efficient Brønsted Acid Promoter for the Umpolung of N-Ac Indoles in Hydroarylation Reactions. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701074] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Raj Kumar Nandi
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO); Univ. Paris-Sud; Université Paris-Saclay; CNRS UMR 8182 91405 Orsay cedex
| | - Alejandro Perez-Luna
- Sorbonne Universités; UPMC Univ Paris 06; CNRS UMR 8232; Institut Parisien de Chimie Moléculaire (IPCM); FR 2769, Case 229, 4 place Jussieu 75005 Paris France
| | - Didier Gori
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO); Univ. Paris-Sud; Université Paris-Saclay; CNRS UMR 8182 91405 Orsay cedex
| | - Rodolphe Beaud
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO); Univ. Paris-Sud; Université Paris-Saclay; CNRS UMR 8182 91405 Orsay cedex
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO); Univ. Paris-Sud; Université Paris-Saclay; CNRS UMR 8182 91405 Orsay cedex
| | - Cyrille Kouklovsky
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO); Univ. Paris-Sud; Université Paris-Saclay; CNRS UMR 8182 91405 Orsay cedex
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO); Univ. Paris-Sud; Université Paris-Saclay; CNRS UMR 8182 91405 Orsay cedex
- Institut de Chimie des Substances Naturelles; CNRS UPR 2301; Univ. Paris-Sud; Université Paris-Saclay; 1, av. de la Terrasse 91198 Gif-sur-Yvette France
| | - Guillaume Vincent
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO); Univ. Paris-Sud; Université Paris-Saclay; CNRS UMR 8182 91405 Orsay cedex
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