1
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Panday S, Maity T, Bhatti P, Laha JK. Direct access to pyrrole anhydrides via oxidative self-coupling of pyrrole carboxaldehydes. Org Biomol Chem 2024; 22:3045-3052. [PMID: 38536061 DOI: 10.1039/d4ob00052h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2024]
Abstract
An elegant synthesis of pyrrole-2-carboxylic acid anhydrides from pyrrole-2-carboxaldehydes using TBAI as a catalyst and tert-butyl hydroperoxide (TBHP) as an oxidant is described herein. Unlike the previous reports wherein pyrrole-2-carboxylic acids were invariably used, we report here for first time the oxidative self-coupling of N-benzyl pyrrole-2-carboxaldehydes for the synthesis of 1-benzyl-1H-pyrrole-2-carboxylic anhydrides. In addition, a one-pot synthesis of novel pyrrole-2-carboxamides from pyrrole-2-carboxaldehydes is also reported. The mechanistic investigation supports a previously unexplored oxidative self-coupling of a pyrrole acyl radical, leading to the synthesis of a carboxylic anhydride.
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Affiliation(s)
- Surabhi Panday
- Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India.
| | - Tapas Maity
- Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India.
| | - Pratibha Bhatti
- Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India.
| | - Joydev K Laha
- Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Punjab 160062, India.
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2
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Liu H, Mai X, Xian J, Liu S, Zhang X, Li B, Chen X, Li Y, Xie F. Construction of Spirocyclic Pyrrolo[1,2- a]quinoxalines via Palladium-Catalyzed Hydrogenative Coupling of Phenols and Nitroarenes. J Org Chem 2022; 87:16449-16457. [PMID: 36455265 DOI: 10.1021/acs.joc.2c02158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
The replacement of fossil resources with biomass resources in the construction of N-heterocycles is rapidly attracting research interest. Herein, we report palladium-catalyzed selective hydrogenative coupling of nitroarenes and phenols based on a transfer hydrogenation strategy, allowing straightforward access to spirocyclic pyrrolo- and indolo-fused quinoxalines, a class of compounds found in numerous natural alkaloids. The synthetic protocol is characterized by a broad substrate scope and the utilization of biomass-derived reactants and commercially available catalysts. In such transformations, high-pressure and explosive hydrogen are not required. This report provides a new protocol for converting biomass-derived phenols into value-added nitrogen-containing chemicals.
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Affiliation(s)
- Haibo Liu
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Xiaomin Mai
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Jiayi Xian
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Shuting Liu
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Xiangyu Zhang
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Bin Li
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Xiuwen Chen
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Yibiao Li
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
| | - Feng Xie
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China
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3
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Geng M, Huang M, Kuang J, Fang W, Miao M, Ma Y. Application of N, N-Dimethylethanolamine as a One-Carbon Synthon for the Synthesis of Pyrrolo[1,2- a]quinoxalines, Quinazolin-4-ones, and Benzo[4,5]imidazoquinazolines via [5 + 1] Annulation. J Org Chem 2022; 87:14753-14762. [PMID: 36254464 DOI: 10.1021/acs.joc.2c02079] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The synthesis of N-heterocycles composes a significant part of synthetic chemistry. In this report, a Cu(II)-catalyzed green and efficient synthesis of pyrrolo[1,2-a]quinoxaline, quinazolin-4-one, and benzo[4,5]imidazoquinazoline derivatives was developed, employing N,N-dimethylethanolamine (DMEA) as a C1 synthon. Green oxidant O2 is critical in these transformations, facilitating the formation of a key intermediate─a reactive iminium ion. The method conducted under mild conditions is compatible with a diversity of functional groups, providing an appealing alternative to the previously developed protocols.
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Affiliation(s)
- Meiqi Geng
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang, 318000 Zhejiang, Taizhou, China.,Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, 310018 Zhejiang, Hangzhou, China
| | - Minzhao Huang
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang, 318000 Zhejiang, Taizhou, China
| | - Jinqiang Kuang
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang, 318000 Zhejiang, Taizhou, China
| | - Weiwei Fang
- International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University (NFU), Nanjing 210037, China
| | - MaoZhong Miao
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, 310018 Zhejiang, Hangzhou, China
| | - Yongmin Ma
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang, 318000 Zhejiang, Taizhou, China
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4
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An Effient Synthesis of Pyrrolo[1,2‐
a
]quinoxaline Derivatives via Isocyanide Insertion into the N−H Bond of 2‐(1
H
‐pyrrol‐1‐yl)anilines. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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5
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Ahn J, Lee SB, Song I, Chun S, Oh DC, Hong S. Synthesis of 4-Aryl Pyrrolo[1,2-α]quinoxalines via Iron-Catalyzed Oxidative Coupling from an Unactivated Methyl Arene. J Org Chem 2021; 86:7390-7402. [PMID: 34028267 DOI: 10.1021/acs.joc.1c00371] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Herein, we describe the direct synthesis of pyrrolo[1,2-α]quinoxaline via oxidative coupling between methyl arene and 1-(2-aminophenyl) pyrroles. Oxidation of the benzylic carbon of the methyl arene was achieved by di-t-butyl peroxide in the presence of an iron catalyst, followed by conversion to an activated aldehyde in situ. Oxygen played a crucial role in the oxidation process to accelerate benzaldehyde formation. Subsequent Pictet-Spengler-type annulation completed the quinoxaline structure. The protocol tolerated various kinds of functional groups and provided 22 4-aryl pyrrolo[1,2-α]quinoxalines when various methyl arene derivatives were used. The developed method proceeded in air, and all catalysts, reagents, and solvents were easily accessible.
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Affiliation(s)
- Jiwon Ahn
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Seok Beom Lee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Injae Song
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Simin Chun
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Dong-Chan Oh
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
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6
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Gataullin RR. Advances in the Synthesis of Benzo‐Fused Spiro Nitrogen Heterocycles: New Approaches and Modification of Old Strategies. Helv Chim Acta 2020. [DOI: 10.1002/hlca.202000137] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Rail R. Gataullin
- Ufa Federal Research Centre Ufa Institute of Chemistry of the Russian Academy of Sciences Prospect Oktyabrya, 71 Ufa 450054 Russian Federation
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7
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Babar K, Zahoor AF, Ahmad S, Akhtar R. Recent synthetic strategies toward the synthesis of spirocyclic compounds comprising six-membered carbocyclic/heterocyclic ring systems. Mol Divers 2020; 25:2487-2532. [PMID: 32696299 DOI: 10.1007/s11030-020-10126-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 07/07/2020] [Indexed: 12/12/2022]
Abstract
Spirocyclic compounds fascinate the synthetic chemists due to their privileged ring system and efficacy in drug discovery. Many natural compounds comprise spirocyclic moiety in their skeleton and are effective in pharmaceutical industry. Over the years, many synthetic methodologies have been established for the construction of spirocyclic compounds. In this review, recent synthetic approaches to accessing various spirocompounds comprising six-membered carbocycles/heterocycles have been summarized.
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Affiliation(s)
- Kashaf Babar
- Department of Chemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan
| | - Ameer Fawad Zahoor
- Department of Chemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan.
| | - Sajjad Ahmad
- Department of Chemistry, University of Engineering and Technology, Faisalabad, 38000, Pakistan
| | - Rabia Akhtar
- Department of Chemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan
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