The first total synthesis of （+）-5α-hydroxy-isopterocarpolone （1）, an oxygenated eudesmane isolated from Chinese folk medicine Artemisia eriopoda, starting from （+）-dihydrocarvone（2） was described. Compound 4...The first total synthesis of （+）-5α-hydroxy-isopterocarpolone （1）, an oxygenated eudesmane isolated from Chinese folk medicine Artemisia eriopoda, starting from （+）-dihydrocarvone（2） was described. Compound 4 was stereoselectively prepared from compound 2 in three steps according to reference-. The treatment of tosylhydrazone 5, which was formed via the reaction of compound 4 and TsNHNH2 catalyzed by BF3-5Et2O, with an excess of n-butyllithium gave triene 6. Oxidation of triene 6 with singlet oxygen afforded the desired endo-peroxide 7 as a single product. Reductive cleavage of peroxide 7 with K2CO3 gave α-rotunol 3, a natural eudesmane firstly isolated in 1969. Hydrolysis of α-rotunol 3 with 10% sulfuric acid afforded （+）-5α-hydroxy-isopterocarpolone （1）. The structures of all the compounds were confirmed by IR, MS and NMR spectra.展开更多
3-Oxo-11,12,13-trihydroxyeudesm-4-ene(1) was a highly oxygenated natural eudesmane isolated from traditional herbal medicine with an antiphlogostic and spasmolytic activity.For the purpose of pharmacological activity ...3-Oxo-11,12,13-trihydroxyeudesm-4-ene(1) was a highly oxygenated natural eudesmane isolated from traditional herbal medicine with an antiphlogostic and spasmolytic activity.For the purpose of pharmacological activity research on natural product 1 and its derivatives,a facile total synthesis of compound 1 starting from(+)-dihydrocarvone(2) was completed in an overall yield of 24%.The structures of all intermediates and product 1 were confirmed via 1H NMR,13C NMR,MS and IR techniques.The NMR data of compound 1 are in agreement with those of natural products.展开更多
A facile and efficient diastereoselective synthesis of methyl 3β-hydroxyeudesmane-4,11(13)-dien-12-oicate starting from (+)-dihydrocarvone has been carried out in 9 steps at the first time.
为研究长叶香茶菜Rabdosia stracheyi(Benth ex Hook.)Hara的化学成分,本文采用硅胶、反相硅胶C 18、葡聚糖凝胶Sephadex LH-20、反相半制备高效液相等色谱方法对长叶香茶菜地上部分进行分离、纯化,利用1 H NMR、13 C NMR、HR-ESI-MS等...为研究长叶香茶菜Rabdosia stracheyi(Benth ex Hook.)Hara的化学成分,本文采用硅胶、反相硅胶C 18、葡聚糖凝胶Sephadex LH-20、反相半制备高效液相等色谱方法对长叶香茶菜地上部分进行分离、纯化,利用1 H NMR、13 C NMR、HR-ESI-MS等波谱数据,结合参考文献,鉴定化合物的结构。结果表明,从长叶香茶菜地上部分分离得到12个三萜类化合物,它们分别是木栓醇(1)、齐墩果酸(2)、3β-羟基-齐墩果烷-11,13(18)-二烯-28酸(3)、2α,3α-二羟基齐墩果-12-烯-28酸(4)、2 a,3a,24-三羟基-12-烯-28-齐墩果酸(5)、2α,3β,24-三羟基齐墩果-12-烯-28酸(6)、cleistocalyxin(7)、熊果醇(8)、2α-羟基乌苏酸(9)、2a,3a,24-三羟基熊果-12,20(30)-二烯-28-酸甲酯(10)、maquatic acid(11)和2α,3α,24-三羟基-12,20(30)-二烯乌苏酸(12)。以上得到的三萜类化合物均为首次从该植物中分离得到。展开更多
文摘The first total synthesis of （+）-5α-hydroxy-isopterocarpolone （1）, an oxygenated eudesmane isolated from Chinese folk medicine Artemisia eriopoda, starting from （+）-dihydrocarvone（2） was described. Compound 4 was stereoselectively prepared from compound 2 in three steps according to reference-. The treatment of tosylhydrazone 5, which was formed via the reaction of compound 4 and TsNHNH2 catalyzed by BF3-5Et2O, with an excess of n-butyllithium gave triene 6. Oxidation of triene 6 with singlet oxygen afforded the desired endo-peroxide 7 as a single product. Reductive cleavage of peroxide 7 with K2CO3 gave α-rotunol 3, a natural eudesmane firstly isolated in 1969. Hydrolysis of α-rotunol 3 with 10% sulfuric acid afforded （+）-5α-hydroxy-isopterocarpolone （1）. The structures of all the compounds were confirmed by IR, MS and NMR spectra.
文摘3-Oxo-11,12,13-trihydroxyeudesm-4-ene(1) was a highly oxygenated natural eudesmane isolated from traditional herbal medicine with an antiphlogostic and spasmolytic activity.For the purpose of pharmacological activity research on natural product 1 and its derivatives,a facile total synthesis of compound 1 starting from(+)-dihydrocarvone(2) was completed in an overall yield of 24%.The structures of all intermediates and product 1 were confirmed via 1H NMR,13C NMR,MS and IR techniques.The NMR data of compound 1 are in agreement with those of natural products.
文摘A facile and efficient diastereoselective synthesis of methyl 3β-hydroxyeudesmane-4,11(13)-dien-12-oicate starting from (+)-dihydrocarvone has been carried out in 9 steps at the first time.
文摘为研究长叶香茶菜Rabdosia stracheyi(Benth ex Hook.)Hara的化学成分,本文采用硅胶、反相硅胶C 18、葡聚糖凝胶Sephadex LH-20、反相半制备高效液相等色谱方法对长叶香茶菜地上部分进行分离、纯化,利用1 H NMR、13 C NMR、HR-ESI-MS等波谱数据,结合参考文献,鉴定化合物的结构。结果表明,从长叶香茶菜地上部分分离得到12个三萜类化合物,它们分别是木栓醇(1)、齐墩果酸(2)、3β-羟基-齐墩果烷-11,13(18)-二烯-28酸(3)、2α,3α-二羟基齐墩果-12-烯-28酸(4)、2 a,3a,24-三羟基-12-烯-28-齐墩果酸(5)、2α,3β,24-三羟基齐墩果-12-烯-28酸(6)、cleistocalyxin(7)、熊果醇(8)、2α-羟基乌苏酸(9)、2a,3a,24-三羟基熊果-12,20(30)-二烯-28-酸甲酯(10)、maquatic acid(11)和2α,3α,24-三羟基-12,20(30)-二烯乌苏酸(12)。以上得到的三萜类化合物均为首次从该植物中分离得到。
