5
|
One-step synthesis of 4-alkyl-3-aryl-2,6-dicyanoanilines and their use in the synthesis of highly functionalized 2,3,5,6,7- and 2,3,4,5,7-substituted indoles. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.08.064] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
6
|
Falk FC, Fröhlich R, Paradies J. Coupling of ortho-substituted aryl chlorides with bulky amides. Chem Commun (Camb) 2011; 47:11095-7. [PMID: 21909550 DOI: 10.1039/c1cc14844c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Voluminous amides were coupled with deactivated, sterically hindered aryl chlorides in excellent yields providing products, which have not been efficiently accessible by transition metal catalysis so far. Application of an unsymmetric bisphosphine ligand was critical for the high catalytic activity.
Collapse
Affiliation(s)
- Florian C Falk
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, D-76131 Karlsruhe, Germany
| | | | | |
Collapse
|
7
|
Bheemanapalli LN, Akkinepally RR, Pamulaparthy SR. Synthesis and antibacterial activity of a new series of 2,3,5,7-substituted-pyrido[2,3-d]pyrimidin-4(3h)-one derivatives. Chem Pharm Bull (Tokyo) 2008; 56:1342-8. [PMID: 18758116 DOI: 10.1248/cpb.56.1342] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new series of 2,3,5,7-substituted-pyrido[2,3-d]pyrimidin-4(3H)-one derivatives were prepared from 2-amino-N,6-substituted phenyl-4-(trifluoromethyl or methyl)nicotinamides. The key intermediate 2-amino-N,6-substituted phenyl-4-(trifluoromethyl or methyl)nicotinamides were synthesized from 2-bromo-N,6-disubstituted phenyl-4-(trifluoromethyl or methyl)nicotinamides as well as from ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) coupling of 2-amino-4,6-substituted nicotinic acid and substituted arylamines. All the synthesized compounds were screened for antibacterial activity against Gram +ve and Gram -ve bacteria. Compound 7c showed better antibacterial activity against Gram +ve and Gram -ve bacteria.
Collapse
Affiliation(s)
- Lakshmi Narayana Bheemanapalli
- Department of Pharmaceutical Chemistry, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | | | | |
Collapse
|
8
|
Yi C, Blum C, Liu SX, Frei G, Neels A, Renaud P, Leutwyler S, Decurtins S. An Efficient and Facile Synthesis of Highly Substituted 2,6-Dicyanoanilines. J Org Chem 2008; 73:3596-9. [DOI: 10.1021/jo800260b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chenyi Yi
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| | - Carmen Blum
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| | - Shi-Xia Liu
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| | - Gabriela Frei
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| | - Antonia Neels
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| | - Philippe Renaud
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| | - Samuel Leutwyler
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| | - Silvio Decurtins
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland, and Institut de Microtechnique, Université de Neuchâtel, Rue Jaquet Droz 1, CH-2002 Neuchâtel, Switzerland
| |
Collapse
|
9
|
Yakaiah T, Lingaiah BPV, Narsaiah B, Kumar KP, Murthy USN. GdCl3 catalysed Grieco condensation: A facile approach for the synthesis of novel pyrimidine and annulated pyrimidine fused indazole derivatives in single pot under mild conditions and their anti-microbial activity. Eur J Med Chem 2008; 43:341-7. [PMID: 17521778 DOI: 10.1016/j.ejmech.2007.03.031] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2007] [Revised: 03/20/2007] [Accepted: 03/26/2007] [Indexed: 11/26/2022]
Abstract
Indazole regioisomers such as 3-amino-4-(trifluoromethyl)-6-phenyl-1H-indazole-7-carbonitrile 1 and 3-amino-6-(trifluoromethyl)-4-phenyl-1H-indazole-7-carbonitrile 2 were independently reacted with formaldehyde followed by unsymmetrical, symmetrical and cyclic electron rich olefins in presence of GdCl(3) as catalyst and obtained pyrimidine fused indazole derivatives 3 and 4, respectively. The reaction is found to be concerted and an exclusive product is formed. Representative examples of compounds 3 and 4 were screened against Gram-positive, Gram-negative bacteria and fungal species such as yeast and filamentous fungi in vitro. Compound 3f showed significant activity against all species of Gram-positive and Gram-negative bacteria, whereas compounds 3h and 4a showed the least activity with reference to penicillin as well as streptomycin. Similarly compound 3c showed promising activity against yeast and filamentous fungi whereas compound 3f is inactive at the maximum concentration of 150 microg/mL.
Collapse
Affiliation(s)
- T Yakaiah
- Fluoroorganic Division, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India
| | | | | | | | | |
Collapse
|
10
|
Yakaiah T, Lingaiah BPV, Narsaiah B, Shireesha B, Ashok Kumar B, Gururaj S, Parthasarathy T, Sridhar B. Synthesis and structure-activity relationships of novel pyrimido[1,2-b]indazoles as potential anticancer agents against A-549 cell lines. Bioorg Med Chem Lett 2007; 17:3445-53. [PMID: 17428660 DOI: 10.1016/j.bmcl.2007.03.087] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2006] [Revised: 03/05/2007] [Accepted: 03/27/2007] [Indexed: 10/23/2022]
Abstract
A series of novel pyrimido[1,2-b]indazoles 5, 7 have been prepared from 3-trifluoromethyl-5-phenyl-2,6-dicyano anilines 1 via novel indazole regioisomers 3 and 4 through a facile strategy. Specific examples were evaluated for anticancer activity in vitro and found to exhibit promising activity against A-549 cell lines and are more effective than Etoposide. QSAR models were developed and validated by cross-validation method. The results of the best QSAR model were further compared with the crystal structure of tubulin protein. The binding energies estimated were found to have a good correlation with the experimental inhibitory potencies.
Collapse
Affiliation(s)
- T Yakaiah
- Fluoroorganic Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Kanth SR, Reddy GV, Yakaiah T, Narsaiah B, Rao PS. ZnBr2‐Catalyzed Efficient Oxidative Homo Coupling of Aryl Magnesium Bromides. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397910600775499] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
12
|
Kanth SR, Reddy GV, Maitraie D, Narsaiah B, Rao PS, Kumar KR, Sridhar B. Iron(III) chloride catalysed three-component Grieco condensation: Synthesis of tetrahydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidines/quinazolines. J Fluor Chem 2006. [DOI: 10.1016/j.jfluchem.2006.06.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
13
|
Ravi Kantha S, Venkat Reddy G, Hara Kishore K, Shanthan Rao P, Narsaiaha B, Surya Narayana Murthy U. Convenient synthesis of novel 4-substitutedamino-5-trifluoromethyl–2,7-disubstituted pyrido[2,3-d] pyrimidines and their antibacterial activity. Eur J Med Chem 2006; 41:1011-6. [PMID: 16766088 DOI: 10.1016/j.ejmech.2006.03.028] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2005] [Revised: 03/27/2006] [Accepted: 03/27/2006] [Indexed: 11/19/2022]
Abstract
Novel pyrido[2,3-d]pyrimidines 4 have been synthesised starting from 2-amino-4-trifluoromethyl-6-substituted nicotinonitriles 1 via imine formation, selective amination followed by Dimroth rearrangement. Compounds 4 were screened against Gram +ve and -ve bacteria in vitro. Compounds 4h and 4d showed significant activity against all species of Gram positive bacteria and moderate activity against Gram negative bacteria. N-2,4 difluorophenyl compounds 4l and 4m were the least active among all the compounds. All the compounds were inactive against Pseudomonas aeruginosa at the maximum concentration of 200 microg ml(-1).
Collapse
Affiliation(s)
- S Ravi Kantha
- Fluoroorganics Division, Indian Institute of Chemical Technology, Hyderabad, India
| | | | | | | | | | | |
Collapse
|