[reaction: see text]Reaction of indole amides 5 with tributylstannane gave spiroindolenines 9 which are readily converted into spiropyrrolidinyloxindoles. This tricyclic system is found in a number of interesting natural products.

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published as an Advance Article on the web Reaction of indole 19 via the derived aryl radical gives the tetracycle 20 in 43% yield. This compound contains the ABCE-rings of both Aspidosperma and Strychnos alkaloids.

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A Tandem Radical Approach to the ABCE-Rings of the Aspidosperma and Strychnos Alkaloids.-Reaction of indole (VI) via the derived aryl radical gives the tetracycle (VII). This compound contains the ABCE-rings of both aspidosperma and strychnos alkaloids. The corresponding indole lacking the cyano group does not afford the target system. -(HILTON, STEPHEN T.; HO, TIM C. T.; PLJEVALJCIC, GORAN; SCHULTE, MARCUS; JONES, KEITH; Chem.