Crystal Structures and Vapor-Induced Crystalline Transformation of 7-Ethyl-10-Hydroxycamptothecin Pseudopolymorphs
Crystal Structures and Vapor-Induced Crystalline Transformation of 7-Ethyl-10-Hydroxycamptothecin Pseudopolymorphs
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DOI：
10.1016/j.xphs.2017.03.020
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发表时间：
2017-10-01
影响因子：
3.8
通讯作者：
Tao, Xutang
中科院分区：
文献类型：
--
作者：
Fang, Lan;Wang, Lei;Tao, Xutang
构建了抗癌药物7-乙基-10-羟基喜树碱（SN 38）的溶剂诱导3种骨架（一水合物、甲醇溶剂化物和二甲基甲酰胺溶剂化物）。首次用单晶X射线衍射技术对3种假多晶型物的晶体结构进行了表征。所有这些多晶型物的晶体结构分析显示，一水合物显示通过氢键连接的3D框架。在甲醇溶剂化物中，甲醇分子通过分子间氢键将一维分子链连接起来，形成二维片层。DMF溶剂化物在沿着b轴方向呈现一维氢键连接的链状结构。已经研究了一水合物、甲醇溶剂化物和DMF溶剂化物的蒸气诱导转化。说明了3种立体框架之间的转换关系。关于转变机制的见解已经建立从考虑晶体结构。(C)2017年美国药学协会（R）。爱思唯尔公司出版All rights reserved.
Solvent-induced 3 frameworks (the monohydrate, methanol solvate, and dimethyl formamide [DMF] solvate) of an anticancer drug, 7-ethyl-10-hydroxycamptothecin (SN38), were constructed. The crystal structures of the 3 pseudopolymorphs were characterized by single-crystal X-ray diffraction technique for the first time. Crystal structure analysis of all these polymorphs revealed that the monohydrate showed 3D frameworks linked by hydrogen bonds. In the methanol solvate, the 1D molecular chains were linked by the methanol molecules through intermolecular hydrogen bonds to form a 2D sheet. The DMF solvate exhibits the 1D hydrogen bonding-linked chains along b-axis. Vapor-induced transformation has been investigated for the monohydrate, the methanol solvate, and the DMF solvate. The conversion relationships among the 3 solid frameworks are illustrated. Insights regarding transformation mechanisms have been established from consideration of the crystal structures. (C) 2017 American Pharmacists Association (R). Published by Elsevier Inc. All rights reserved.