2,9-Bis-(trimethylsilyl)-3,4-dihydropyrido[3,4-b]indolium trifluoromethanesulphonate reacts with the lithio derivatives of 3-cyano-4-methylpyridines to generate pentacyclic amidines which, upon hydrolysis and oxidation, produce naucléfine, angustine, and angustidine.
D. B. Repke, Jahangir, R. D. Clark and D. B. MacLean, J. Chem. Soc., Chem. Commun., 1988, 439 DOI: 10.1039/C39880000439
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