ChemInform Abstract: Lewis Acid Promoted Reactions of Ethenetricarboxylates with Allenes: Synthesis of Indenes and γ‐Lactones via Conjugate Addition/Cyclization Reaction.

Abstract

Lewis Acid Promoted Reactions of Ethenetricarboxylates with Allenes: Synthesis of Indenes and γ-Lactones via Conjugate Addition/Cyclization Reaction. -Lewis acid promoted treatment of ethenetricarboxylates and the nitrile (Ie) with arylallenes allows new access to indenes. The reaction with 1,1-dialkylallenes, on the other hand, provides γ-lactones. The latter are also available from the acid (Ia) and aryl-and diarylallenes. -(YAMAZAKI*, S.; YAMAMOTO, Y.; FUKUSHIMA, Y.; TAKEBAYASHI, M.; UKAI, T.; MIKATA, Y.; J. Org. Chem. 75 (2010) 15, 5216-5222,