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Akyildiz V, Lafzi F, Kilic H, Saracoglu N. Solvent-controlled regioselective C(5)-H/N(1)-H bond alkylations of indolines and C(6)-H bond alkylations of 1,2,3,4-tetrahydroquinolines with para-quinone methides. Org Biomol Chem 2022; 20:3570-3588. [PMID: 35419578 DOI: 10.1039/d2ob00035k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Solvent-promoted and -controlled regioselective bond alkylation reactions of para-quinone methides (p-QMs) with N-H free-indoline and 1,2,3,4-tetrahydroquinoline (THQ) under metal-free conditions have been developed. In the presence of 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as the solvent, 1,6-addition alkylation reactions of p-QMs with NH-free indolines and THQs efficiently gave C5-alkylated indolines and C6-alkylated THQs. Using catalytic amounts of HFIP in DCM, the reaction of indolines and p-QMs resulted in the alkylation of indolines at the N1-position. HFIP plays two roles in the reactions: converting the indoline and THQ into bidentate nucleophiles and activating the p-QMs to achieve the 1,6-addition alkylation via hydrogen bond clusters. The indoline and THQ act as a C-nucleophile due to the H-bond clusters between HFIP and the nitrogen atom, whereas upon using catalytic amounts of HFIP, the compounds act as an N-nucleophile. All alkylation products were transformed into the corresponding indoles and quinolines via oxidation in the presence of diethyl azodicarboxylate (DEAD). Furthermore, the synthetic utilities have been showcased with both the removal of the tert-butyl groups from the C5-alkylated indole products and submission to their Suzuki coupling reactions.
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Affiliation(s)
- Volkan Akyildiz
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum, 25240, Turkey.
| | - Ferruh Lafzi
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum, 25240, Turkey.
| | - Haydar Kilic
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum, 25240, Turkey.
| | - Nurullah Saracoglu
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum, 25240, Turkey.
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2
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Kumar S, Vaishanv NK, Mohanan K. Efficient Construction of 3‐Fluoroalkylated Oxindoles Enabled by Zwitterion Catalysis. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sandeep Kumar
- Central Drug Research Institute Medicinal and Process Chemistry Division Lucknow INDIA
| | | | - Kishor Mohanan
- CSIR-Central Drug Research Institute Medicinal and Process Chemistry Sector-10Jankipuram ExtensionSitapur Road 226031 Lucknow INDIA
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Kaliyamoorthy A, Rayaroth A, Elikkottil A, Chithra MJ, A. V. K, Reddy VS. Regioselective Allenylation and Propargylation of Various para-Quinone Methides Using Alkynyl Azaarenes as Pronucleophile. Chem Commun (Camb) 2022; 58:10671-10674. [DOI: 10.1039/d2cc03439e] [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 have developed a Brønsted base-mediated regioselective allenylation and propargylation of various para-quinone methides using unfunctionalized 2-alkynyl azaarenes as the pronucleophile. The appropriate choice of a base provides an opportunity...
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Liu D, Xu H, Hang Y, Lu H. 1,6-Addition of Nitrogen Nucleophile to para-Quinone Methides Catalyzed by Recyclable Bismuth Complex: Facile Access to N-Heterocyclic Substituted Unsymmetric Triarylmethane Derivatives. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202109026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Pan HP, Zhu ZQ, Qiu ZW, Liu HF, Ma JD, Li BQ, Feng N, Ma AJ, Peng JB, Zhang XZ. Dearomatization of 2,3-Disubstituted Indoles via 1,8-Addition of Propargylic (Aza)- para-Quinone Methides. J Org Chem 2021; 86:16518-16534. [PMID: 34714074 DOI: 10.1021/acs.joc.1c01857] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dearomatization of indole is a useful strategy to access indolimines: a motif widely exists in biologically active molecules and natural products. Herein, an efficient method for the dearomatization of 2,3-disubstituted indoles to generate diverse indolimines with tetrasubstituted allenes is described. This work accomplishes dearomatization of 2,3-disubstituted indoles through 1,8-addition of (aza)-para-quinone methides, which are generated in situ from propargylic alcohols. A series of synthetically useful indolimines containing quaternary carbon centers and tetrasubstituted allenes can be accessed in good yields (up to 99%). Additionally, the separability of product isomers, diversified product transformations, and easy scale-up of the reaction demonstrate the potential application of this method.
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Affiliation(s)
- Han-Peng Pan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Zhi-Qiang Zhu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Zong-Wang Qiu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Hong-Fu Liu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Jiong-Dong Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Bao Qiong Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Na Feng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Xiang-Zhi Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
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6
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Lafzi F, Kilic H. Metal‐ and Additive‐Free C3‐Functionalization of Imidazo[1,2‐
a
]pyridines with
para
‐Quinone Methides. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100313] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ferruh Lafzi
- Department of Chemistry Faculty of Sciences Atatürk University 25240 Erzurum Turkey
| | - Haydar Kilic
- Department of Chemistry Faculty of Sciences Atatürk University 25240 Erzurum Turkey
- Oltu Vocational Training School Atatürk University 25400 Erzurum Turkey
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Qiu ZW, Li BQ, Liu HF, Zhu ZQ, Pan HP, Feng N, Ma AJ, Peng JB, Zhang XZ. Formal (3 + 4)-Annulation of Propargylic p-Quinone Methides with 2-Indolylmethanols: Synthesis of Polysubstituted Indole-Fused Oxepines. J Org Chem 2021; 86:7490-7499. [PMID: 34004118 DOI: 10.1021/acs.joc.1c00484] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A novel Brønsted acid catalyzed 1,8-addition mediated (3 + 4)-annulation of in situ generated propargylic p-quinone methides with 2-indolylmethanols is described. This method provides a convenient and mild approach to structurally interesting and synthetically important polysubstituted indole-fused oxepines in high yields. Moreover, 2-indolylmethanols as four-atom synthons in the (3 + 4)-annulations under Brønsted acid conditions have been explored for the first time.
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Affiliation(s)
- Zong-Wang Qiu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Bao Qiong Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Hong-Fu Liu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Zhi-Qiang Zhu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Han-Peng Pan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Na Feng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Xiang-Zhi Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
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Qiu ZW, Xu XT, Pan HP, Jia ZS, Ma AJ, Peng JB, Du JY, Feng N, Li BQ, Zhang XZ. Brønsted Acid-Catalyzed Formal (3+3)-Annulation of Propargylic (Aza)- para-Quinone Methides with 4-Hydroxycoumarins and 1,3-Dicarbonyl Compounds. J Org Chem 2021; 86:6075-6089. [PMID: 33820419 DOI: 10.1021/acs.joc.0c02844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Herein, we describe a highly effective 1,8-conjugate-addition-mediated formal (3+3)-annulation of (aza)-para-quinone methides in situ generated from propargylic alcohols with 4-hydroxycoumarins and 1,3-dicarbonyl compounds under the catalysis of a Brønsted acid. This methodology affords efficient and practical access to synthetically important and highly functionalized pyranocoumarins and pyrans in excellent yields under mild conditions. Importantly, these products exhibit impressive inhibitory activity toward α-glucosidase.
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Affiliation(s)
- Zong-Wang Qiu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Xue-Tao Xu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Han-Peng Pan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Zhen-Sheng Jia
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Ji-Yuan Du
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Na Feng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Bao Qiong Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Xiang-Zhi Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
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Zhang XZ, Li BQ, Qiu ZW, Ma AJ, Peng JB, Du JY, Feng N, Xu XT, Pan HP. Synthesis of Naphthopyrans via Formal (3+3)-Annulation of Propargylic (Aza)-para-Quinone Methides with Naphthols. J Org Chem 2020; 85:13306-13316. [DOI: 10.1021/acs.joc.0c01791] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xiang-Zhi Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
| | - Bao Qiong Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
| | - Zong-Wang Qiu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
| | - Ji-Yuan Du
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, People’s Republic of China
| | - Na Feng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
| | - Xue-Tao Xu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
| | - Han-Peng Pan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People’s Republic of China
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