A Concise Formal Synthesis of Alkaloid Cryptotackiene and Substituted 6H-Indolo[2,3-b]quinolines
The Journal of Organic Chemistry2004Vol. 69(17), pp. 5760–5762
Citations Over TimeTop 25% of 2004 papers
Abstract
A five-step formal synthesis of alkaloid cryptotackiene and its 2-formyl, 11-methyl/phenyl derivatives involving conjugate addition of enolate anion from cyclohexanone (or 4-methylcyclohexanone) to bis[(methylsulfanyl)methylene]-2-oxindole followed by heterocyclization in the presence of ammonium acetate as the key step has been developed. The 11-methylsulfanyl group in the initial precursor can be either desulfurized (Raney Ni) or replaced by methyl/phenyl groups via nickel-catalyzed cross-coupling reaction with appropriate Grignard reagents.
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