Iguesterin, pristimerin, tingenone, beta-amyrin, beta-sitosterol and maytenonic acid have been isolated from the light petroleum extract of the stem bark and iguesterin, pristimerin, tingenone, beta-amyrin and beta-sitosterol from the root bark of Gymnosporia montana.
The new phenols 6-oxo-tingenol, 3-O-methyl-6-oxo-tingenol and 6-oxo-iguesterol were isolated from the root bark of Maytenus canariensis. Their structures were determined by 1H and 13C NMR spectroscopic studies, including HMQC, HMBC, DEPT and ROESY and chemical transformations. The synthesis of