Indolo[2,3-a]quinolizines 3 were stereoselectively synthesized by the intramolecular double Michael reaction of amide esters 2, the indole nitrogen of which was protected with a tosyl group, using ButMe2SiOSO2CF3 in the presence of Et3N.
M. Ihara, Y. Ishida, Y. Tokunaga, C. Kabuto and K. Fukumoto, J. Chem. Soc., Chem. Commun., 1995, 2085 DOI: 10.1039/C39950002085
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