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首页> 外文期刊>Journal of chemical crystallography >Crystal structure and absolute configuration of the indole alkaloid arborescidine C
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Crystal structure and absolute configuration of the indole alkaloid arborescidine C

机译：吲哚生物碱阿糖胞苷C的晶体结构和绝对构型

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摘要

The structure and absolute configuration (3R, 17R) of the indole alkaloid arborescidine C were determined by x-ray diffraction. The six-membered ring assumes a half-chair conformation and the seven-membered ring has a twist-like conformation. The crystal packing is characterized by intermolecular hydrogen-bonding between the hydroxyl group and nitrogen atom N4 which leads to the formation of infinite chains of molecules along the a-axis of the crystal. The absolute configurations of two related indole alkaloids, arborescidine B and arborescidine D are inferred from the experimentally determined configuration of arborescidin C molecule. A comparison of the present structure with that of a related indole alkaloid akagerine showed significant conformational and configurational differences. Crystal data: C16H19N2OBr, orthorhombic, P2(1)2(1)2, a = 10.3376(8), b = 15.461(4), c = 9.2094(9)Angstrom, V = 1471.9(6)Angstrom(3), Z = 4, D-calc = 1.510 g cm(-3), lambda = 1.54178 Angstrom. [References: 13]
机译：通过X射线衍射测定吲哚生物碱阿糖胞苷C的结构和绝对构型（3R，17R）。六元环具有半椅构型，七元环具有类似扭曲的构型。晶体堆积的特征在于羟基和氮原子N4之间的分子间氢键，这导致沿晶体的a轴形成分子的无限链。两种相关的吲哚生物碱的绝对构型是从阿波西汀C分子的实验确定的构型中推断出来的。本结构与相关吲哚生物碱akagerine的结构比较显示出显着的构象和构型差异。晶体数据：C16H19N2OBr，正交晶，P2（1）2（1）2，a = 10.3376（8），b = 15.461（4），c = 9.2094（9）埃，V = 1471.9（6）埃（3）， Z = 4，D-calc = 1.510 g cm（-3），λ= 1.54178埃。 [参考：13]

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