Synthesis of Vinca alkaloids and related compounds. 21. Preparation of (.+-.)-eburnamonine, (.+-.)-3-epieburnamonine, and (.+-.)-C-norquebrachamine from a common intermediate

L'intermediaire commun est l'ethyl-1α octahydro indolo [2,3-a] quinolizinemethanol-1β; etude RX d'un derive de methano-3,7azecino [5,4-b] indole