Annotinine revisited. A new pentacyclo[7.3.3.01,13.02,12.05,13]pentadecane ester and other products derived from annotinine

Abstract

Several annotinine derivatives were prepared and their conformations were determined on the basis of 1D NMR and 2D NMR spectra (GCOSY, HMQC, HMBC, TROESY). One of these compounds has new unique 5-ring skeleton.Key words: alkaloids, chemical tranformations, structure elucidation, conformation.