作者:Yun-Lian Lin、Yu-Ling Tsai、Yueh-Hsiung Kuo、Yi-Hung Liu、Ming-Shi Shiao
DOI:10.1021/np9901332
日期:1999.11.1
Three new isoprenylbenzenes, tournefolins A (1), B (2), and C (3), and two new 2-ethoxy-4,5-dihydroxybenzoyl compounds, 4 and 5, together with the known compounds, salicylic acid and allantoin, were isolated fi om the stems of Tournefortia sarmentosa. The structures of new compounds were elucidated as 2-(4 beta-methyltetrahydrofuran-2 alpha-yl)-5-(4 beta-methyltetrahydrofuran-2 beta-yl)-1,4-dihydroxybenzene(1), methyl 5-(5-hydroxy-2-methoxyphenyl)-3-furoate (2), methyl 5-(2,5-dihydroxyphenyl)-3-furoate (3), 2-ethoxy-4,5-dihydroxybenzaldehyde (4), and 2-ethoxy-4,5-dihydroxybenzoic acid (5), on the basis of spectral and chemical methods. The relative configuration of 1 was determined by single-crystal X-ray crystallography.