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Paper | Regular issue | Vol 31, No. 8, 1990, pp.1477-1484
Published online, 1st January, 1970
DOI: 10.3987/COM-90-5406
Synthesis of Aspidosperma Alkaloids: Eight-membered vs. Six-membered Ring D Formatnion

Monique Dufour, Jean-Claude Gramain,* Henri-Philippe Husson, Marie-Eve Sinibaldi, and Yves Troin

*Chimie des Substances Naturelles, URA 485 CNRS, Université Blaise Pascal, 63177 Aubière Cedex, France

Abstract

Unusual cyclization of the acetyl chain borne at C-20 of a tetracyclic intermediate (11a) or (11b) led to the formation of a pentacyclic analog of aspidosperma alkaloids with an eigth-membered ring D.