TANAKA, JUICHI;NOBUTANI, KIMIAKI;ADACHI, KAZUO, NIPPON KAGAKU KAJSI,(1988) N 7, S. 1065-1073
作者:TANAKA, JUICHI、NOBUTANI, KIMIAKI、ADACHI, KAZUO
DOI:——
日期:——
Stereochemistry and oxidative degradation of a dimeric thymol derivative from Arnica sachalinensis
作者:Claus M Passreiter、Horst Weber、Dieter Bläser、Roland Boese
DOI:10.1016/s0040-4020(01)01139-5
日期:2002.1
thymol derivative 1 with a novelspiro[benzofuran-3(2H),2′-pyrano[2,3-b]benzofuran] ring system isolated from Arnica sachalinensis (Asteraceae), but the stereochemistry of this compound remained unclear. Attempts to simplify the structure by oxidation of the hemiacetal to the lactone only resulted in the formation of degradation products. Therefore we produced suitable crystals to perform X-ray analysis
最近,我们描述了一种具有新型螺[苯并呋喃-3(2 H),2'-吡喃并[2,3- b ]苯并呋喃]环系统的二聚百里香酚衍生物1,该系统是从茶树中提取的,但该化合物的立体化学仍不清楚。试图通过将半缩醛氧化成内酯来简化结构仅导致降解产物的形成。因此,我们制备了合适的晶体进行X射线分析,结果表明1由两种对映体的混合物组成,具有以下构型:8 R,8 'S,9 S,9 'S和8 S,8'R,9 R,9′R。