Cephalomappa sinensis(Euphorbiaceae) is a monotypic genus ever-green tree endemic to the calcareous mountainous region in southwest of Guangxi Zhuang Autonomous Region.Its fresh branches are used as feeding stuff for ...Cephalomappa sinensis(Euphorbiaceae) is a monotypic genus ever-green tree endemic to the calcareous mountainous region in southwest of Guangxi Zhuang Autonomous Region.Its fresh branches are used as feeding stuff for cattle,horse,sheep,and can make them strong.To find the possibility of developing feed additive or medicine for livestock,the chemical constituents from this plant were studied.The chemical constituents of its roots had been reported in our earlier papers.In continuation of our investigation on the branches of Cephalomappa sinensis,a new norneolignan,named Ceplignan(1),was isolated from ethanol extract through column chromatography.The structure was elucidated on the basis of spectroscopic evidence.展开更多
自胡椒科胡椒属植物樟叶胡椒(Piper polysyphorum C. DC)中分离到六个新木脂素(neolignans)类化合物,经光谱(UV,IR,MS,~1H-NMR,^(13)C-NMR,2D-NMR,CD)分析及衍生物制备,确定Ⅱ为新化合物,即threo-△~7-7-羟基-3,4,5,3′,5′-五甲氧基-8-...自胡椒科胡椒属植物樟叶胡椒(Piper polysyphorum C. DC)中分离到六个新木脂素(neolignans)类化合物,经光谱(UV,IR,MS,~1H-NMR,^(13)C-NMR,2D-NMR,CD)分析及衍生物制备,确定Ⅱ为新化合物,即threo-△~7-7-羟基-3,4,5,3′,5′-五甲氧基-8-O-4′-新木脂素,为一对对映体,命名为樟叶素(polysyphorin),Ⅰ,Ⅲ,Ⅳ为新的对映体,分別为(+)-virolongin,(+)-grandisin及(+)-lancifolin D.化合物Ⅴ为南藤素(wallichinine),Ⅵ为山蒟素D(hancinone D)。血小板活化因子(PAF)受体结合实验及PAF引起的血小板聚集实验证明化合物Ⅰ～Ⅴ具有明显的抑制活性。展开更多
以3,4-二羟基苯丙烯酸（咖啡酸）为原料,经酯化和仿生氧化偶联反应得到苯并呋喃类化合物2-（3′,4′-二羟基苯基）-3-甲氧羰基-5-甲氧羰基乙烯基-7-羟基-2,3-二氢苯并呋喃（1）和苯并二氧六环类化合物2-（3′,4′-二羟基苯基）-3-甲氧羰...以3,4-二羟基苯丙烯酸（咖啡酸）为原料,经酯化和仿生氧化偶联反应得到苯并呋喃类化合物2-（3′,4′-二羟基苯基）-3-甲氧羰基-5-甲氧羰基乙烯基-7-羟基-2,3-二氢苯并呋喃（1）和苯并二氧六环类化合物2-（3′,4′-二羟基苯基）-3-甲氧羰基-6-甲氧羰基乙烯基-2,3-二氢-1,4-苯并二氧六环（2）,然后经乙酰化、DDQ氧化脱氢、Pd/C 催化氢化、氢化铝锂还原、碱性条件下脱乙酰基等反应,合成了一系列苯并呋喃新木脂素类化合物3~7和苯并二氧六环新木脂素类化合物8~10.所合成化合物的结构已由核磁共振法（1 H NMR,13 C NMR）、质谱法（MS）进行了表征.其中5~7,9和10是未见文献报道的新化合物,8为天然产物异美商陆醇A.采用MTT法对所合成的苯并呋喃新木脂素类化合物1,3~5进行了生物活性测试.结果表明：化合物1,3,4和5对白血病细胞（HL-60）、肺癌细胞（A-549）、乳腺癌细胞（MCF-7）、结肠癌细胞（SW-480）、肝癌细胞（SMMC-7721）有良好的体外生长抑制活性.展开更多
文摘Cephalomappa sinensis(Euphorbiaceae) is a monotypic genus ever-green tree endemic to the calcareous mountainous region in southwest of Guangxi Zhuang Autonomous Region.Its fresh branches are used as feeding stuff for cattle,horse,sheep,and can make them strong.To find the possibility of developing feed additive or medicine for livestock,the chemical constituents from this plant were studied.The chemical constituents of its roots had been reported in our earlier papers.In continuation of our investigation on the branches of Cephalomappa sinensis,a new norneolignan,named Ceplignan(1),was isolated from ethanol extract through column chromatography.The structure was elucidated on the basis of spectroscopic evidence.
文摘以3,4-二羟基苯丙烯酸（咖啡酸）为原料,经酯化和仿生氧化偶联反应得到苯并呋喃类化合物2-（3′,4′-二羟基苯基）-3-甲氧羰基-5-甲氧羰基乙烯基-7-羟基-2,3-二氢苯并呋喃（1）和苯并二氧六环类化合物2-（3′,4′-二羟基苯基）-3-甲氧羰基-6-甲氧羰基乙烯基-2,3-二氢-1,4-苯并二氧六环（2）,然后经乙酰化、DDQ氧化脱氢、Pd/C 催化氢化、氢化铝锂还原、碱性条件下脱乙酰基等反应,合成了一系列苯并呋喃新木脂素类化合物3~7和苯并二氧六环新木脂素类化合物8~10.所合成化合物的结构已由核磁共振法（1 H NMR,13 C NMR）、质谱法（MS）进行了表征.其中5~7,9和10是未见文献报道的新化合物,8为天然产物异美商陆醇A.采用MTT法对所合成的苯并呋喃新木脂素类化合物1,3~5进行了生物活性测试.结果表明：化合物1,3,4和5对白血病细胞（HL-60）、肺癌细胞（A-549）、乳腺癌细胞（MCF-7）、结肠癌细胞（SW-480）、肝癌细胞（SMMC-7721）有良好的体外生长抑制活性.
