<span style="font-family:Verdana;">Chemical investigation of the MeOH extract from the leaves of </span><i><span style="font-family:Verdana;">C.</span></i> <i...<span style="font-family:Verdana;">Chemical investigation of the MeOH extract from the leaves of </span><i><span style="font-family:Verdana;">C.</span></i> <i><span style="font-family:Verdana;">glauca</span></i> <span><span style="font-family:Verdana;">yielded nine known triterpenoids (</span><b><span style="font-family:Verdana;">1-9</span></b><span style="font-family:Verdana;">) belonging to the cycloartane and</span></span><span style="font-family:Verdana;"> friedelane series. Two of these compounds namely glaucartanoic acid A (</span><b><span style="font-family:Verdana;">1</span></b><span style="font-family:Verdana;">) and 3</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">,21</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">-dihydroxy-30-nor-(D:A)-friedoolean-20(29)-en-27-oic acid (</span><b><span style="font-family:Verdana;">5</span></b><span style="font-family:Verdana;">) were subjected to chemical derivatizations and afforded five new derivatives: diacetylglaucartanoic acid A (</span><b><span style="font-family:Verdana;">1a</span></b><span style="font-family:Verdana;">), 24-acetylglaucartanoic acid A (</span><b><span style="font-family:Verdana;">1b</span></b><span style="font-family:Verdana;">), glaucartanoic acid A methyl ester (</span><b><span style="font-family:Verdana;">1c</span></b><span style="font-family:Verdana;">), 24-methoxyglaucartanoic acid A methyl </span><span><span style="font-family:Verdana;">ester (</span><b><span style="font-family:Verdana;">1d</span></b><span style="font-family:Verdana;">), and 3</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">,21</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">-diacetoxy-30-nor-(D:A)-friedoolean-20(29)-en-27-oic</span></span><span style="font-family:Verdana;"> acid (</span><b><span style="font-family:Verdana;">5a</span></b><span style="font-family:Verdana;">). Their structures were 展开更多
文摘<span style="font-family:Verdana;">Chemical investigation of the MeOH extract from the leaves of </span><i><span style="font-family:Verdana;">C.</span></i> <i><span style="font-family:Verdana;">glauca</span></i> <span><span style="font-family:Verdana;">yielded nine known triterpenoids (</span><b><span style="font-family:Verdana;">1-9</span></b><span style="font-family:Verdana;">) belonging to the cycloartane and</span></span><span style="font-family:Verdana;"> friedelane series. Two of these compounds namely glaucartanoic acid A (</span><b><span style="font-family:Verdana;">1</span></b><span style="font-family:Verdana;">) and 3</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">,21</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">-dihydroxy-30-nor-(D:A)-friedoolean-20(29)-en-27-oic acid (</span><b><span style="font-family:Verdana;">5</span></b><span style="font-family:Verdana;">) were subjected to chemical derivatizations and afforded five new derivatives: diacetylglaucartanoic acid A (</span><b><span style="font-family:Verdana;">1a</span></b><span style="font-family:Verdana;">), 24-acetylglaucartanoic acid A (</span><b><span style="font-family:Verdana;">1b</span></b><span style="font-family:Verdana;">), glaucartanoic acid A methyl ester (</span><b><span style="font-family:Verdana;">1c</span></b><span style="font-family:Verdana;">), 24-methoxyglaucartanoic acid A methyl </span><span><span style="font-family:Verdana;">ester (</span><b><span style="font-family:Verdana;">1d</span></b><span style="font-family:Verdana;">), and 3</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">,21</span><i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">-diacetoxy-30-nor-(D:A)-friedoolean-20(29)-en-27-oic</span></span><span style="font-family:Verdana;"> acid (</span><b><span style="font-family:Verdana;">5a</span></b><span style="font-family:Verdana;">). Their structures were
