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Volumn 76, Issue 4, 2011, Pages 1163-1166

Synthesis of 2,4-diiodoquinolines via the photochemical cyclization of o-alkynylaryl isocyanides with iodine

Author keywords

[No Author keywords available]

Indexed keywords

GOOD YIELD; INTRAMOLECULAR CYCLIZATIONS; ISOCYANIDES; METAL-CATALYZED CROSS-COUPLING REACTIONS; PHOTO-IRRADIATION;

EID: 79951638034     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo1021772     Document Type: Article
Times cited : (75)

References (60)
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    • For the conversion methods of C-X bonds in quinolines, see the following papers
    • For the conversion methods of C-X bonds in quinolines, see the following papers: Cherng, Y.-J. Tetrahedron 2002, 58, 1125
    • (2002) Tetrahedron , vol.58 , pp. 1125
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    • For recent reports on the synthesis of quinolines, see the following references
    • For recent reports on the synthesis of quinolines, see the following references: Cho, C. S.; Oh, B. H.; Kim, J. S.; Kim, T.-J.; Shim, S. C. Chem. Commun. 2000, 1885
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    • Cho, C.S.1    Oh, B.H.2    Kim, J.S.3    Kim, T.-J.4    Shim, S.C.5
  • 31
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    • For the synthesis of quinolines containing halogen atoms, see the following references
    • For the synthesis of quinolines containing halogen atoms, see the following references: Takaya, J.; Kagoshima, H.; Akiyama, T. Org. Lett. 2000, 2, 1577
    • (2000) Org. Lett. , vol.2 , pp. 1577
    • Takaya, J.1    Kagoshima, H.2    Akiyama, T.3
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    • For the synthesis of quinoline derivatives from a radical reaction of aryl isocyanides with iodobenzene derivatives, see the following papers
    • For the synthesis of quinoline derivatives from a radical reaction of aryl isocyanides with iodobenzene derivatives, see the following papers: Josien, H.; Ko, S.-B.; Bom, D.; Curran, D. P. Chem.-Eur. J. 1998, 4, 67
    • (1998) Chem.-Eur. J. , vol.4 , pp. 67
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    • A plausible reaction pathway for the photochemical diiodocyclization of o-alkynylaryl isocyanides may involve the photochemical aza-Bergman cyclization that yields 2,4-biradical species. The sequential abstraction of iodine by the 2,4-biradical species affords the corresponding 2,4-diiodoquinolines. Indeed, a theoretical study on the (Z)-enyne isocyanide system suggests the possibility of aza-Bergman cyclization. See
    • A plausible reaction pathway for the photochemical diiodocyclization of o-alkynylaryl isocyanides may involve the photochemical aza-Bergman cyclization that yields 2,4-biradical species. The sequential abstraction of iodine by the 2,4-biradical species affords the corresponding 2,4-diiodoquinolines. Indeed, a theoretical study on the (Z)-enyne isocyanide system suggests the possibility of aza-Bergman cyclization. See: Debbert, S. L.; Cramer, C. J. Int. J. Mass Spectrom. 2000, 201, 1
    • (2000) Int. J. Mass Spectrom. , vol.201 , pp. 1
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    • To clarify the reaction pathway, we also conducted the photochemical reaction of isocyanide 1a with tributyltin hydride, which has excellent carbon-radical-capturing ability. The reaction afforded 3-phenylquinoline in 76% yield, and 2-tributylstannyl-3-phenyl quinoline was not obtained. These results strongly suggest that the photochemical reaction of o-alkynylaryl isocyanides follows the aza-Bergman cyclization via the formation of 2,4-biradical species.
    • To clarify the reaction pathway, we also conducted the photochemical reaction of isocyanide 1a with tributyltin hydride, which has excellent carbon-radical-capturing ability. The reaction afforded 3-phenylquinoline in 76% yield, and 2-tributylstannyl-3-phenyl quinoline was not obtained. These results strongly suggest that the photochemical reaction of o-alkynylaryl isocyanides follows the aza-Bergman cyclization via the formation of 2,4-biradical species.
  • 60
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    • 1H NMR spectra, respectively. Both peaks indicated the formation of the corresponding 2-hydroquinolines by the elimination of iodide.
    • 1H NMR spectra, respectively. Both peaks indicated the formation of the corresponding 2-hydroquinolines by the elimination of iodide.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.