Author:
Dalton LK,Demerac S,Elmes BC,Loder JW,Swan JM,Teitei T
Abstract
Orthophosphoric acid has
been found to accomplish the previously unsuccessful cyclization of azomethines
of 3-formylcarbazoles and aminoacetal to substituted pyrido[4,3-b]carbazoles
according to a scheme proposed by Cranwell and
Sexton. By this method, there have been prepared 6,11-dimethyl-(ellipticine),
5,6,11-trimethyl-, 5,9,11- trimethyl-, 9-methoxy-5,11-dimethyl- (9-methoxyellipticine), 9-methoxy- 5,6,11-trimethyl-,
9-bromo-6,11-dimethyl-, and 9-nitro-5,11-dimethyl- 6H-pyrido[4,3-b]carbazole.
Cited by
269 articles.
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