Synthesis 2011(19): 3195-3203  
DOI: 10.1055/s-0030-1260162
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

An Efficient Route for the Synthesis of Isochromenocarbazolones through Palladium-Catalyzed Intramolecular ortho-Arylation

Devanga K. Sreenivas, Rajagopal Nagarajan*
School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
e-Mail: rnsc@uohyd.ernet.in;
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Publikationsverlauf

Received 13 May 2011
Publikationsdatum:
08. August 2011 (online)

Abstract

A new efficient protocol for the synthesis of iso­chro­meno[3,4-b]-, [4,3-a]-, -[4,3-b]-, and -[3,4-c]carbazolones has been successfully established via palladium-catalyzed intramolecular ortho-arylation of C-H bond under ligand-free conditions.

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The CCDC deposition number for compound 4b is 823151; formula: C26H15NO2; unit cell parameters: a = 8.2147(7), b = 9.9766(7), c = 12.2199(11), α = 88.285(6), β = 87.066(7), γ = 67.350(7); space group P 1. The CCDC deposition number for compound 4d is 824502; formula: C22H17NO2; unit cell parameters: a = 7.5580(5), b = 19.9905(8), c = 10.6520(6); space group Pna21. The CCDC deposition number for compound 5d is 823152; formula: C22H17NO2; unit cell parameters: a = 8.5988(6), b = 15.5481(14), c = 14.6529(12), β = 122.242(6); space group P21/c. The CCDC deposition number for compound 5f is 824503; formula: C23H19NO2; unit cell parameters: a = 7.5027(6), b = 9.1436(12), c = 12.7349(13), α = 100.156(0), β = 101.632(8), γ = 92.456(9); space group P 1.