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■ Cyclopropanation of Carbon-Carbon Double Bonds in Ring D of Ergot Alkaloids

Mária Incze, Gábor Dörnyei, Péter Kovács, Orsolya Egyed, György Hajós, and Csaba Szántay*

*Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Szt. Gellért tér 4, Hungary

Abstract

Some alkaloid derivatives containing a double bond in ring D have been reacted with diazomethane/palladium diacetate reagent to result in formation of a fused cyclopropane ring. This procedure proved to be generally applicable for cyclopropanation of Ergot alkaloids.