title: Four tetracyclic oxindole alkaloids and a taberpsychine derivative from a Malayan Tabernaemontana.
abstract: Four tetracyclic oxindole alkaloids, 7(R)- and 7(S)-geissoschizol oxindole (1 and 2), 7(R),16(R)- and 7(S),16(R)-19(E)-isositsirikine oxindole (3 and 4), in addition to a taberpsychine derivative, N(4)-demethyltaberpsychine (5), were isolated from the Malayan Tabernaemontana corymbosa and the structures were established using NMR and MS analysis.
authors: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors: Kuan-Hon
authors: KH
authors: Lim
authors: Department of Chemical Science, Faculty of Science, Engineering and Technology, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia.
authors: Kooi-Mow
authors: KM
authors: Sim
authors: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors: Guan-Huat
authors: GH
authors: Tan
authors: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: tskam@um.edu.my.
authors: Toh-Seok
authors: TS
authors: Kam
mesh_terms: D026121:Indole Alkaloids / Q000737:chemistry / Q000302:isolation & purification*; D007211:Indoles / Q000737:chemistry / Q000302:isolation & purification; D008296:Malaysia; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D000078183:Oxindoles; D013237:Stereoisomerism; D030014:Tabernaemontana / Q000737:chemistry*
chemical_list: D026121:Indole Alkaloids; D007211:Indoles; C543073:N(4)-demethyltaberpsychine; D000078183:Oxindoles; C022960:2-oxindole