Synthesis of indole alkaloid analogues containing the novel hexahydropyrrolo[1′,2′,3′:1,9a,9]imidazo[1,2-a]indole skeleton by ring-closing reactions of tryptophan-derived α-amino nitriles

1. González-Vera, J.A.
2. Teresa García-López, M.
3. Herranz, R.