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Paper | Regular issue | Vol 41, No. 9, 1995, pp.1939-1950
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6866
A Photochemical Approach to Spiranic 2,3-Indolines, Useful Intermediates in Pentacyclic Indole Alkaloid Synthesis

Malika Ibrahim-Ouali, Marie-Eve Sinibaldi, Yves Troin, Annie Cuer, Gérard Dauphin, and Jean-Claude Gramain

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


Spirolactones (4) and (5) were obtained by photocyclization of arylenaminolactones (8) and (9). The stereochemistry of the ring junction in tricyclic spiranic compounds was determined by NOE difference spectroscopy.