| 摘要: | Four new cucurbitane-type triterpenes, cucurbita-5,23(E)-diene-3β,7β,25-triol (1), 3β-acetoxy-7β-methoxycucurbita-5,23(E)-dien-25-ol (2), cucurbita-5(10),6,23(E)-triene-3β,25-diol (5), and cucurbita-5,24-diene-3,7,23-trione (6), together with four known triterpenes, 3β,25-dihydroxy-7β-methoxycucurbita-5,23(E)-diene (3), 3β-hydroxy-7β,25-dimethoxycucurbita-5,23(E)-diene (4), 3β,7β,25-trihydroxycucurbita-5,23(E)-dien-19-al (7), and 25-methoxy-3β,7β-dihydroxycucurbita-5,23(E)-dien-19-al (8), were isolated from the methyl alcohol extract of the stems of Momordica charantia. The structures of the new compounds were elucidated by spectroscopic methods. |
