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   An expeditious I sub(2)-catalyzed entry into 6H-indolo[2,3-b]quinoline system of cryptotackieine  
A synthesis of a series of novel 6H-indolo[2,3-b]- quinolines with different substituents on the quinoline ring is described. The method involves reaction of indole-3-carboxyaldehyde with aryl amines in the presence of a catalytic amount of iodine in refluxing diphenyl ether to yield indolo[2,3-b]quinolines in one-pot. The present approach provides a new route for the synthesis of polycyclic structures related to an alkaloid cryptotackieine (neocryptolepine)

For more information please read:
Parvatkar, P.T.; Parameswaran, P.S.; Tilve, S.G. An expeditious I sub(2)-catalyzed entry into 6H-indolo[2,3-b]quinoline system of cryptotackieine. J. Org. Chem.: 74(21); 2009; 8369-8372.
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