Synthesis and Crystal Structure of Benzoyloxymethyl (4α,8β,13β)-13-methyl-16-oxo-17-norkauran-18-carbonate Ester
作者:Jin Cai、Wen Zhou、Junqing Chen、Min Sun、Min Ji
DOI:10.1007/s10870-008-9435-6
日期:2009.2
Isosteviol derivative: benzoyloxymethyl (4α,8β,13β)-13-methyl-16-oxo-17-norkauran-18-carbonate ester was synthesized by esterification of isosteviol with chloromethyl benzoate and its crystal structure was determined by X-ray diffraction method. The compound crystallizes in the triclinic space group P1 with unit cell parameters: a = 8.784(3) Å, b = 9.079(3) Å, c = 15.950(6) Å, α = 79.343(6)°, β = 79.061(5)°, γ = 89.849(5)°, Z= 2. The conformation of rings A and B is chair, whereas the conformation of ring C is unsymmetrical twist chair. The carbonyl group at the C20 is coplanar with the benzene ring. The fragment of the ester group occupying the pseudoaxial site of C1 position adopts a zigzag conformation. Isosteviol derivative: benzoyloxymethyl (4α,8β,13β)-13-methyl-16-oxo-17-norkauran -18-carbonate ester was synthesized and its crystal structure was determined by X-ray diffraction method.
通过异雌二醇与苯甲酸氯甲酯的酯化反应,合成了异雌二醇衍生物:苯甲酰氧基甲基(4α,8β,13β)-13-甲基-16-氧代-17-去甲乌兰-18-碳酸酯,并通过 X 射线衍射法测定了其晶体结构。该化合物在三菱空间群 P1 中结晶,其单胞参数为:a = 8.784(3) 埃,b = 9.079(3) 埃,c = 15.950(6) 埃,α = 79.环 A 和环 B 的构象为椅状,而环 C 的构象为非对称扭转椅状。位于 C20 的羰基与苯环共面。占据 C1 位置假轴位点的酯基片段采用之字形构象。合成了异雌二醇衍生物:苯甲酰氧基甲基 (4α,8β,13β)-13-甲基-16-氧代-17-胭脂虫草素-18-碳酸酯,并用 X 射线衍射法测定了其晶体结构。