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Volumn , Issue 24, 2008, Pages 3981-3987

Palladium-catalyzed indole and azaindole synthesis by direct annulation of electron-poor o-chloroanilines and o-chloroaminopyridines with aldehydes

Author keywords

Annulation; Azaindole; Indole; Ligand; Palladium

Indexed keywords

ALDEHYDES; LIGANDS; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS;

EID: 58149356741     PISSN: 00397881     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-0028-1083225     Document Type: Article
Times cited : (45)

References (53)
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    • For recent reviews on the construction of the indole ring, see: (a) Gribble, G. W. J. Chem. Soc., Perkin Trans. 1 2000, 1045.
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    • For recent reviews on palladium-catalyzed synthesis of indoles, see: (a) Cacchi, S.; Fabrizi, G. Chem. Rev. 2005, 105, 2873.
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    • Cacchi, S.1    Fabrizi, G.2
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    • For reports on palladium-catalyzed indole synthesis, see: (a) Mori, M.; Chiba, K.; Ban, Y. Tetrahedron Lett. 1977, 1037.
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    • From o-chloroaniline, see: Nazaré, M.; Schneider, C.; Lindenschmidt, A.; Will, D. W. Angew. Chem. Int. Ed. 2004, 43, 4526.
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    • For reviews of palladium-catalyzed cross-coupling reactions of aryl chlorides, see: a
    • For reviews of palladium-catalyzed cross-coupling reactions of aryl chlorides, see: (a) Littke, A. F.; Fu, G. C. Angew. Chem. Int. Ed. 2002, 41, 4176.
    • (2002) Angew. Chem. Int. Ed , vol.41 , pp. 4176
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  • 37
  • 44
    • 58149356097 scopus 로고    scopus 로고
    • Reaction of o-chloroaniline with phenylacetaldehyde (1.0 equiv or 3.0 equiv) gave the expected indole in 55 and 70% yield, respectively. Reaction of 2-chloro-5-methoxyaniline with methyl (S)-2-N,N-di-tert-butoxycarbonyl-5-oxo-pentanoate (1.0 equiv or 3.0 equiv) gave the 6-methoxy-tryptophan derivative in 21 and 25% yield, respectively. Reaction of 2-chloro-5-methylaniline with phenylacetaldehyde (1.0 equiv or 3.0 equiv) gave the 5-methyl-3-phenyl-1H-indole in 56 and 67% yield, respectively. 1H NMR (300 MHz, CDCl3, δ, 8.08 (br s, 1 H, 7.77 (s, 1 H, 7.70 (dd, J, 1.2, 7.4 Hz, 2 H, 7.49 (t, J, 7.4 Hz, 2 H, 7.35-7.31 (m, 3 H, 7.10 (d, J, 8.4 Hz, 1 H, 2.52 (s, 3 H, 13C NMR 75 MHz, CDCl3, δ, 135.7, 134.9, 129.6, 128.7, 127.5, 125.9, 125.8, 124.0, 121.9, 119.4, 117.8, 111.0, 21.6
    • 3): δ = 135.7, 134.9, 129.6, 128.7, 127.5, 125.9, 125.8, 124.0, 121.9, 119.4, 117.8, 111.0, 21.6.
  • 48
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    • For recent reports on azaindole synthesis, see: a
    • For recent reports on azaindole synthesis, see: (a) McLaughlin, M.; Palucki, M.; Davies, I. W. Org. Lett. 2006, 8, 3307.
    • (2006) Org. Lett , vol.8 , pp. 3307
    • McLaughlin, M.1    Palucki, M.2    Davies, I.W.3


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