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Hsu WS, Tsai MH, Barve IJ, Yellol GS, Sun CM. Synthesis of Aminofuran-Linked Benzimidazoles and Cyanopyrrole-Fused Benzimidazoles by Condition-Based Skeletal Divergence. ACS COMBINATORIAL SCIENCE 2017; 19:492-499. [PMID: 28445030 DOI: 10.1021/acscombsci.7b00052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A condition-based skeletal divergent synthesis was explored to achieve skeletal diversity in two component condensation reaction. Cyanomethyl benzimidazole was reacted with α-bromoketone under thermal conditions to furnish 2-aminofuranyl-benzimidazoles, while the same reaction afforded 3-cyano-benzopyrrolo-imidazoles under microwave irradiation. Two nonequivalent nucleophilic centers on benzimidazole moiety were manipulated elegantly by different reaction conditions to achieve the skeletal diversity.
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Affiliation(s)
- Wei-Shun Hsu
- Department
of Applied Chemistry, 1001 Ta-Hseuh Road, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Min-Huan Tsai
- Department
of Applied Chemistry, 1001 Ta-Hseuh Road, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Indrajeet J. Barve
- Department
of Applied Chemistry, 1001 Ta-Hseuh Road, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Gorakh S. Yellol
- Department
of Applied Chemistry, 1001 Ta-Hseuh Road, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Chung-Ming Sun
- Department
of Applied Chemistry, 1001 Ta-Hseuh Road, National Chiao-Tung University, Hsinchu 300-10, Taiwan
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100,
Shih-Chuan first Road, Kaohsiung 807-08, Taiwan
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2
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Chen CH, Yellol GS, Tsai CH, Dalvi PB, Sun CM. Diastereoselective synthesis of bridged polycyclic alkaloids via tandem acylation/intramolecular Diels-Alder reaction. J Org Chem 2013; 78:9738-47. [PMID: 24006927 DOI: 10.1021/jo401364s] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A mild and efficient stereoselective synthesis of hexacyclic indole alkaloids with a tetrahydro-β-carboline motif has been developed by utilizing the Pictet-Spengler reaction and tandem N-acylation followed by intramolecular Diels-Alder cyclization. Initially, a diene unit was installed in the tetrahedron β-carboline skeleton through Pictet-Spengler cyclization of the corresponding aldehyde with tryptophan ester. The dienophile moiety was introduced by N-acylation of tetrahydro-β-carboline. Successive, in situ, [4 + 2] intramolecular Diels-Alder cycloaddition of the activated dienophile and conjugated diene containing intermediate furnished bridged polycyclic heterocycles with high diastereoselectivity. Formation of four new rings, five new covalent bonds, and five new chiral centers with excellent stereoselectivity is the key feature of this strategy. The diastereoselective formation of product was attributed to intramolecular chirality transfer through a chiral amino acid. The stereoselective outcome of this tandem reaction was confirmed by X-ray crystallographic studies. The developed synthetic strategy was also explored on a soluble polymer support to incorporate the advantage of rapid synthesis and a high-throughput workup process toward the development of a green synthetic protocol for polycyclic alkaloids.
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Affiliation(s)
- Chih-Hau Chen
- Department of Applied Chemistry, National Chiao Tung University , Hsinchu 300-10, Taiwan, Republic of China
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3
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Chen LH, Wu TY, Paike V, Sun CM. Palladium-catalyzed regioselective synthesis of 2(2 $$^{\prime }$$ ′ -biphenyl)benzimidazoles through C–H activation. Mol Divers 2013; 17:641-9. [DOI: 10.1007/s11030-013-9460-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2013] [Accepted: 07/04/2013] [Indexed: 11/25/2022]
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4
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Maiti B, Chanda K, Selvaraju M, Tseng CC, Sun CM. Multicomponent solvent-free synthesis of benzimidazolyl imidazo[1,2-a]-pyridine under microwave irradiation. ACS COMBINATORIAL SCIENCE 2013; 15:291-7. [PMID: 23590286 DOI: 10.1021/co400010y] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A novel one-pot, three-component reaction employing variously substituted benzimidazole-linked amino pyridines, aldehydes, and isonitriles catalyzed by scandium(III) triflate under solvent-free conditions were accomplished. This new synthetic methodology facilitates the rapid generation of intricate molecular frameworks in three-dimensional fashion leading to benzimidazole-imidazo[1,2-a] pyridines. This approach is envisioned as an environmentally benign process and a simple operation to the biological interesting compounds. The present synthetic sequence permits the introduction of three points of structural diversity to expand chemical space with high purity and excellent yields.
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Affiliation(s)
- Barnali Maiti
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Kaushik Chanda
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Manikandan Selvaraju
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Chih-Chung Tseng
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Chung-Ming Sun
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
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5
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Hsu WS, Paike V, Sun CM. One pot three component reaction for the rapid synthesis of pyrrolo[1,2-a]benzimidazoles. Mol Divers 2013; 17:285-94. [DOI: 10.1007/s11030-013-9433-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Accepted: 02/12/2013] [Indexed: 12/24/2022]
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6
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Chen CH, Tung CL, Sun CM. Microwave-assisted synthesis of highly functionalized guanidines on soluble polymer support. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.05.074] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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7
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Chanda K, Maiti B, Tseng CC, Sun CM. Microwave-assisted linear approach toward highly substituted benzo[d]oxazol-5-yl-1H-benzo[d]imidazole on ionic liquid support. ACS COMBINATORIAL SCIENCE 2012; 14:115-23. [PMID: 22263632 DOI: 10.1021/co200188g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A novel and efficient diversity-oriented synthetic approach was employed to access the benzo[d]oxazol-5-yl-1H-benzo[d]imidazole on ionic liquid support, which helps to absorb microwave irradiation. In this paper, we successfully coupled 4-hydroxy-3-nitrobenzoic acid onto ionic liquid-immobilized o-phenylenediamine, which subsequently underwent an acid mediated, ring closure reaction leading to benzimidazole derivatives. After hydrogenation of the nitro group to an amine, the resulting ionic liquid conjugate was reacted with 1,1-thiocarbonyldiimidazols to yield an ionic liquid tagged-benzoxazol. Final skeletal diversity of the present scaffold was further achieved by S-alkylation with alkyl and aryl bromides. The benzo[d]oxazol-5-yl-1H-benzo[d]imidazole was finally cleaved smoothly from the ionic liquid support with sodium methoxide in methanol under microwave irradiation. This methodology has provided access to a small, diverse library by straightforward and simple operations and could be applied readily in various drug discovery programs.
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Affiliation(s)
- Kaushik Chanda
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Barnali Maiti
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Chih-Chung Tseng
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Chung-Ming Sun
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
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Yellol GS, Chou C, Chang W, Maiti B, Sun C. Microwave‐Enhanced Efficient Regioselective Synthesis of 1,3,4‐Trisubstituted 2‐Mercaptoimidazoles on a Soluble Support. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100640] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Gorakh S. Yellol
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Cheng‐Ting Chou
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Wang‐Jin Chang
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Barnali Maiti
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Chung‐Ming Sun
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan
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9
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Ionic liquid-supported synthesis of dihydroquinazolines and tetrahydroquinazolines under microwave irradiation. Mol Divers 2011; 16:241-9. [DOI: 10.1007/s11030-011-9350-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 12/03/2011] [Indexed: 11/26/2022]
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Thummanagoti S, Yellol GS, Sun CM. Microwave-assisted tandem transformation on an ionic-liquid support: efficient synthesis of pyrrolo/pyridobenzimidazolones and isoindolinone-fused benzimidazoles. Chem Asian J 2011; 6:2471-80. [PMID: 21721136 DOI: 10.1002/asia.201100277] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Indexed: 11/11/2022]
Abstract
A tandem transformation that involves the formation of three bonds and two heterocyclic rings in a one-pot fashion through amino-alkylation of an ionic-liquid-immobilized diamine with keto acids followed by successive double intramolecular cyclizations to afford a tricyclic framework has been explored. This tandem cyclization has been utilized to develop a rapid and efficient method to synthesize various pyrrolo[1,2-a]benzimidazolones and pyrido[1,2-a]benzimidazolones on an ionic-liquid support by using focused microwave irradiation. The application of this tandem cyclization was further extended to the aromatic keto acids to provide isoindolinone-fused benzimidazoles, a structurally heterogeneous library with skeletal diversity. The outcome of the cascade reaction was confirmed by the X-ray crystallographic study of the product directly attached to the ionic-liquid support. Use of the ionic liquid as a soluble support facilitates purification by simple precipitation along with advantages like high loading capacity, homogeneous reaction conditions, and monitoring of the reaction progress by regular conventional spectroscopic methods, whereas application of microwave irradiation greatly accelerates the rate of the reactions.
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Affiliation(s)
- Suman Thummanagoti
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300-10, Taiwan
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11
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Chen CH, Yellol GS, Lin PT, Sun CM. Base-Catalyzed Povarov Reaction: An Unusual [1,3] Sigmatropic Rearrangement to Dihydropyrimidobenzimidazoles. Org Lett 2011; 13:5120-3. [DOI: 10.1021/ol201985p] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chih-Hau Chen
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
| | - Gorakh S. Yellol
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
| | - Po-Tsung Lin
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
| | - Chung-Ming Sun
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
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12
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Chanda K, Maiti B, Chung WS, Sun CM. Novel approach towards 2-substituted aminobenzimidazoles on imidazolium ion tag under focused microwave irradiation. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.06.068] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Thummanagoti S, Yellol GS, Sun CM. Ionic liquid supported multistep divergent synthesis of benzimidazole linked pyrrolo-/pyrido-/isoindolo-benzimidazolones. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.03.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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14
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Chen CH, Kuo J, Yellol GS, Sun CM. Regioselective, Unconventional Pictet-Spengler Cyclization Strategy Toward the Synthesis of Benzimidazole-Linked Imidazoquinoxalines on a Soluble Polymer Support. Chem Asian J 2011; 6:1557-65. [DOI: 10.1002/asia.201000913] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Indexed: 11/10/2022]
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15
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Maiti B, Sun CM. Novel approach towards the synthesis of skeletally diverse benzimidazole-pyrrolo[1,2-a]quinoxaline by SNAr/Pictet–Spengler reaction under focused microwave irradiation. NEW J CHEM 2011. [DOI: 10.1039/c1nj20153k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Lin PT, Salunke DB, Chen LH, Sun CM. Soluble polymer supported divergent synthesis of tetracyclic benzene-fused pyrazino/diazepino indoles: an advanced synthetic approach to bioactive scaffolds. Org Biomol Chem 2011; 9:2925-37. [DOI: 10.1039/c0ob01126f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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