Cj. Moody et Cl. Norton, SYNTHESIS OF 1,2-FUSED INDOLES BY RADICAL CYCLIZATION, Journal of the Chemical Society. Perkin transactions. I, (17), 1997, pp. 2639-2643
Treatment of the 1-(omega-iodoalkyl)indole-3-carbaldehydes 8-13 with t
ributyltin hydride and AIBN results in radical cyclisation to give the
1,2-fused indoles 14-19 containing five-, six-and seven-membered ring
s, The tetrahydropyridoindole 18 is converted into the indolequinone 2
3.