To piscicidal solidagolactones [IV, V, VII and VIII (1~4, cis-clerodane diterpenes)] isolated from Solidago altissima, a non-steroidal conformation was assigned on the basis of chemical and physicocheaical evidence. 13C NMR chemical shifts of methyl groups proved useful for determining stereochemistry of the A/B ring junction in clerodanes. For clerodanes having an epoxide, 1H NMR data and the Tori
对于从拟南芥中分离出的杀伤性固醇内酯[IV,V,VII和VIII(1〜4,顺式-环戊二烯二萜)],根据化学和物理化学证据,确定了非甾体构象。甲基的13 C NMR化学位移被证明可用于确定立达酮中A / B环结的立体化学。对于具有环氧化物的金属亮环酮,1 H NMR数据和Tori方程可用于指定环氧化物构型。使用Cremer的起皱参数来表达固体内酯的构象。
Application of the cd homoallylic benzoate method as a chiroptical tool for determination of absolute configuration
作者:Shunichi Manabe、Nobuyasu Enoki、Chikao Nishino
DOI:10.1016/s0040-4039(00)98965-2
日期:1985.1
After the conformation I was clarified to 5α-,10α,-cis-solidagolactones by 1H NMR measurement with Eu(dpm)3 and chemical transformations, the CD homoallylic benzoate chirality method was applied to the homoallylic alcohol system of solidagolactone IV (1a) for a chiroptical determination of the absoluteconfiguration. The result agreed with absoluteconfiguration elucidated by x-ray analysis, indicating
通过用Eu(dpm)3的1 H NMR测定和化学转化,将构象I澄清为5α-,10α,-顺式-固醇内酯,然后将CD均苯甲酸酯手性法应用于固醇内酯IV(1a)的均相醇体系用于绝对配置的整脊确定。该结果与通过X射线分析所阐明的绝对构型一致,表明了cd法的有用性。