1
|
Popa MM, Georgescu E, Draghici C, Georgescu F, Dumitrascu F, Dumitrescu D. Coumarin substituted pyrrolo-fused heterocyclic systems by 1,3-dipolar cycloadditon reactions. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-015-1563-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
2
|
Popa MM, Georgescu E, Caira MR, Georgescu F, Draghici C, Stan R, Deleanu C, Dumitrascu F. Indolizines and pyrrolo[1,2-c]pyrimidines decorated with a pyrimidine and a pyridine unit respectively. Beilstein J Org Chem 2015. [PMID: 26199663 PMCID: PMC4505085 DOI: 10.3762/bjoc.11.121] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The three possible structural isomers of 4-(pyridyl)pyrimidine were employed for the synthesis of new pyrrolo[1,2-c]pyrimidines and new indolizines, by 1,3-dipolar cycloaddition reaction of their corresponding N-ylides generated in situ from their corresponding cycloimmonium bromides. In the case of 4-(3-pyridyl)pyrimidine and 4-(4-pyridyl)pyrimidine the quaternization reactions occur as expected at the pyridine nitrogen atom leading to pyridinium bromides and consequently to new indolizines via the corresponding pyridinium N-ylides. However, in the case of 4-(2-pyridyl)pyrimidine the steric hindrance directs the reaction to the pyrimidinium N-ylides and, subsequently, to the formation of the pyrrolo[1,2-c]pyrimidines. The new pyrrolo[1,2-c]pyrimidines and the new indolizines were structurally characterized through NMR spectroscopy. The X-ray structures of two of the starting materials, 4-(2-pyridyl)pyrimidine and 4-(4-pyridyl)pyrimidine, are also reported.
Collapse
Affiliation(s)
- Marcel Mirel Popa
- Center for Organic Chemistry C.D. Nenitzescu, Romanian Academy, Spl. Independentei 202B, Bucharest 060023, Romania ; Faculty of Applied Chemistry and Materials Science, 'Politehnica' University of Bucharest, Polizu Street 1-7, 011061 Bucharest, Romania
| | - Emilian Georgescu
- Research Center Oltchim, Str. Uzinei 1, RO 240050, Ramnicu Valcea, Romania
| | - Mino R Caira
- Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
| | - Florentina Georgescu
- Research Dept., Teso Spec SRL, Str. Muncii 53, RO-915200 Fundulea, Calarasi, Romania
| | - Constantin Draghici
- Center for Organic Chemistry C.D. Nenitzescu, Romanian Academy, Spl. Independentei 202B, Bucharest 060023, Romania
| | - Raluca Stan
- Faculty of Applied Chemistry and Materials Science, 'Politehnica' University of Bucharest, Polizu Street 1-7, 011061 Bucharest, Romania
| | - Calin Deleanu
- Center for Organic Chemistry C.D. Nenitzescu, Romanian Academy, Spl. Independentei 202B, Bucharest 060023, Romania
| | - Florea Dumitrascu
- Center for Organic Chemistry C.D. Nenitzescu, Romanian Academy, Spl. Independentei 202B, Bucharest 060023, Romania
| |
Collapse
|
3
|
Wang C, Hu H, Xu J, Kan W. One-pot synthesis of indolizine via 1,3-dipolar cycloaddition using a sub-equivalent amount of K2Cr2O7 as an efficient oxidant under base free conditions. RSC Adv 2015. [DOI: 10.1039/c5ra06019b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
X = Cl or Br; EWG1, EWG2 = electron withdrow group, one-pot reaction, 29 examples, yields from moderate to high, gram scale-up potential confirmed.
Collapse
Affiliation(s)
- Chao Wang
- School of Material Science and Engineering
- Southwest University of Science and Technology
- Mianyang 621010
- P. R. China
| | - Huayou Hu
- Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials
- School of Chemistry and Chemical Engineering
- Huaiyin Normal University
- Huaian 223300
- P. R. China
| | - Juanfang Xu
- School of Material Science and Engineering
- Southwest University of Science and Technology
- Mianyang 621010
- P. R. China
- Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials
| | - Weiqiu Kan
- Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials
- School of Chemistry and Chemical Engineering
- Huaiyin Normal University
- Huaian 223300
- P. R. China
| |
Collapse
|