A Concise Formal Synthesis of Alkaloid Cryptotackiene and Substituted 6<i>H</i>-Indolo[2,3-<i>b</i>]quinolines
作者:G. S. M. Sundaram、C. Venkatesh、U. K. Syam Kumar、H. Ila、H. Junjappa
DOI:10.1021/jo049227t
日期:2004.8.1
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