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2005
Ring closure reactions
O 0130
Synthetic Utility of 2-Benzylidene-1,2,3,4-tetrahydrocarbazol-1-ones. A Facile
of Pyrano[2,3-a]carbazoles, Pyrido[2,3-a]carbazoles and Pyridazi33- 052 Syntheses
no[3,4-a]carbazoles. — In view of their potential as anticancer agents as well as to
develop a short synthetic route to these compounds, the title carbazoles (III), (VI),
(VIII), and (IX) are synthesized. The fused carbazoles are easily accessible from synthons (I). Interestingly, the same reaction of (Ic)—(Ie) with malonitrile (VII) yields the
rearranged products (IX) instead of pyranocarbazoles of type (VIII). The formation of
the hitherto unknown compounds is explained by plausible mechanisms. —
(DANISH, I. A.; PRASAD*, K. J. R.; Collect. Czech. Chem. Commun. 70 (2005) 2,
223-236; Dep. Chem., Bharathiar Univ., Coimbatore 641 046, Tamil Nadu, India;
Eng.) — H. Hoennerscheid
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