Y. Ergun et al., Intermediates for the synthesis of indole alkaloids. Synthesis of tetrahydrocarbazole derivatives, J HETERO CH, 37(1), 2000, pp. 11-14
The synthesis of new precursors 8 and 15 for the synthesis of tetracyclic i
ndole alkaloids were described. Many new intermediates 4-7 and 9-14 have al
so been synthesized.