np0499158_si_002.pdf (121.72 kB)
Two Pyranocoumarins from the Seeds of Calophyllum polyanthum
journal contribution
posted on 2004-09-24, 00:00 authored by Chun-Hui Ma, Bin Chen, Hua-Yi Qi, Bo-Gang Li, Guo-Lin ZhangTwo new pyranocoumarin diastereoisomers, calopolyanolides C (1) and D (2), were isolated from the
ethanolic extract of the seeds of Calophyllum polyanthum, along with calopolyanolide A (3), calopolyanolide
B (4), calanolide E2 (5), 5,7,3‘,4‘-tetrahydroxyisoflavone (6), 3,4-dihydroxybenzoic acid (7), 3,4,5-trihydroxybenzoic acid (8), 2-hydroxy-4-methoxybenzoic acid (9), β-sitosterol (10), β-daucosterol (11), 3,5-dihydroxy-4-methoxybenzoic acid (12), 3,5-dimethoxybenzoic acid (13), and ursolic acid (14). Their
structures were determined by MS, UV, and IR data and HMQC, HMBC, and NOESY experiments or by
comparing them with authentic samples. X-ray crystallographic analysis confirmed the structure and
relative configuration of 1.