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Volumn 28, Issue 13, 2009, Pages 3876-3881

One-step route to 2,3-diaminopyrroles using a titanium-catalyzed four-component coupling

Author keywords

[No Author keywords available]

Indexed keywords

ARYL AMINES; COMPONENT COUPLING; EFFICIENT PROCESS; INTERNAL ALKYNES; ISONITRILE; SELECTIVE GENERATION; SINGLE CRYSTAL X-RAY DIFFRACTION; TERMINAL ALKYNE; TITANIUM COMPLEXES;

EID: 67650296197     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om9001928     Document Type: Article
Times cited : (55)

References (64)
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    • For a recent collection of reviews see: Multicomponent Reactions; Zhu, J., Bienaymé, H., Eds.; Wiley-VCH: New York, 2005.
    • (2005) Multicomponent Reactions
  • 2
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    • For selected recent examples of catalyzed multicomponent couplings to generate heterocycles see: a
    • For selected recent examples of catalyzed multicomponent couplings to generate heterocycles see: (a) Krenske, E. H.; Houk, K. N.; Arndtsen, B. A.; St. Cyr, D. J. J. Am. Chem. Soc. 2008, 130, 10052.
    • (2008) J. Am. Chem. Soc , vol.130 , pp. 10052
    • Krenske, E.H.1    Houk, K.N.2    Arndtsen, B.A.3    St. Cyr, D.J.4
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    • 84890597202 scopus 로고    scopus 로고
    • Zhu, J, Bienaymé, H, Eds, Wiley-VCH: Weinheim
    • (k) Zhu, J., Bienaymé, H., Eds. Multicomponent Reactions; Wiley-VCH: Weinheim, 2005,
    • (2005) Multicomponent Reactions
  • 26
    • 45449094024 scopus 로고    scopus 로고
    • This type of metallacycle has recently been isolated. Vujkovic, N, Fillol, J. L, Ward, B. D, Wadepohl, H, Mountford, P, Gade, L. H. Organometallics 2008, 27, 2518
    • This type of metallacycle has recently been isolated. Vujkovic, N.; Fillol, J. L.; Ward, B. D.; Wadepohl, H.; Mountford, P.; Gade, L. H. Organometallics 2008, 27, 2518.
  • 27
    • 0037074333 scopus 로고    scopus 로고
    • For a review on azadienes in synthesis see: (a) Jayakumar, S.;Ishar, M. P. S.; Mahajan, M. P. Tetrahedron 2002, 58, 379. See also:
    • For a review on azadienes in synthesis see: (a) Jayakumar, S.;Ishar, M. P. S.; Mahajan, M. P. Tetrahedron 2002, 58, 379. See also:
  • 29
    • 67650331418 scopus 로고    scopus 로고
    • Formamidine can become the maj or product in cases where a very unreactive alkyne is used
    • Formamidine can become the maj or product in cases where a very unreactive alkyne is used.
  • 34
    • 33750873079 scopus 로고    scopus 로고
    • For some selected examples of amino pyrroles see: For a general review on amino derivatives of five-membered heterocycles see: a
    • For a general review on amino derivatives of five-membered heterocycles see: (a) Granik, V. G.; Kadushkin, A. V.; Liebscher, J. Adv. Heterocycl. Chem. 1999, 72, 79. For some selected examples of amino pyrroles see:
    • (1999) Adv. Heterocycl. Chem , vol.72 , pp. 79
    • Granik, V.G.1    Kadushkin, A.V.2    Liebscher, J.3
  • 45
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    • Abromovitch, R. A.;Cue,B. WJr. J. Org. Chem. 1973, 38, 173.
    • (l) Abromovitch, R. A.;Cue,B. WJr. J. Org. Chem. 1973, 38, 173.
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    • CSD version 5.29, November 2007
    • CSD version 5.29, November 2007.
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    • For other selected examples of titanium indolyl complexes see: a
    • For other selected examples of titanium indolyl complexes see: (a) Zuo, W.; Sun, W.-H.; Zhang, S.; Hao, P.; Shiga, A. J. Polym. Sei A 2007,45,3415.
    • (2007) J. Polym. Sei A , vol.45 , pp. 3415
    • Zuo, W.1    Sun, W.-H.2    Zhang, S.3    Hao, P.4    Shiga, A.5
  • 61
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    • For these test reactions, phenylacetylene and 1-hexyne were used with aniline at 80 °C in toluene.
    • For these test reactions, phenylacetylene and 1-hexyne were used with aniline at 80 °C in toluene.
  • 62
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    • The double-isonitrile insertion into the Ti-C bond is favored over double insertion into the Ti-N bond of the azatitanacyclobutene because of the precedent for the former related to three-component coupling. In addition, three-component coupling products are often observed as minor products in the reactions of Table 1. However, double insertion into the Ti-N bond could lead to the same observed products. Single insertion into both sides of the azatitanacyclobutene would generate a formyl and amidinate at the two ends of the product; to generate thepyrrole, C-C bond formation would be required from these two groups, which seems unlikely
    • The double-isonitrile insertion into the Ti-C bond is favored over double insertion into the Ti-N bond of the azatitanacyclobutene because of the precedent for the former related to three-component coupling. In addition, three-component coupling products are often observed as minor products in the reactions of Table 1. However, double insertion into the Ti-N bond could lead to the same observed products. Single insertion into both sides of the azatitanacyclobutene would generate a formyl and amidinate at the two ends of the product; to generate thepyrrole, C-C bond formation would be required from these two groups, which seems unlikely.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.