
%0 Journal Article
%A Dalton, LK 
%A Demerac, S 
%A Elmes, BC 
%A Loder, JW 
%A Swan, JM 
%A Teitei, T 
%T Synthesis of the tumour-inhibitory alkaloids, ellipticine, 9-methoxyellipticine, and related pyrido[4,3-b]carbazoles
%J Australian Journal of Chemistry
%D 1967/12/01
%V 20
%N 12
%P 2715-2727
%K 
%R https://doi.org/10.1071/CH9672715
%U https://www.publish.csiro.au/paper/CH9672715 
%X 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. 
