title: Isolation and 1H/13C-NMR Studies on 19,20-Dihydrocondylocarpine: An Alkaloid from the Leaves of Ervatamia coronaria and Alstonia scholaris.
abstract: Studies on the alkaloidal constituents of the leaves of Ervatamia coronaria Stapf and Alstonia scholaris have resulted in the isolation of (20 S)-19,20-dihydrocondylocarpine which has not been previously reported from these plants. The stereochemistry at C-20 was established with the help of n. O. e. difference measurements. (13)C-NMR assignments have been made by polarisation transfer techniques.
authors.affiliation: H. E. J. Research Institute of Chemistry, University of Karachi, Karachi-32, Pakistan.
authors.lastname: Atta-ur-Rahman
authors.forename: K A
authors.initials: KA
authors.lastname: Alvi
authors.forename: A
authors.initials: A
authors.lastname: Muzaffar