Solid Phase Behavior, Polymorphism, and Crystal Structure Features of Chiral Drug Metaxalone
作者:Alexander A. Bredikhin、Dmitry V. Zakharychev、Aidar T. Gubaidullin、Zemfira A. Bredikhina
DOI:10.1021/acs.cgd.8b00874
日期:2018.11.7
In addition to the previously known A-rac and B-rac polymorphs of the chiral drug metaxalone 1, an enantiopure A-(S)-form was obtained and studied. According to X-ray analysis, the crystalline organization of this form is close to the A-rac-1 polymorph. Crystallization of metaxalone melts is accompanied by the formation of a previously unknown metastable C-phase, which in the case of both racemic and
除了手性药物美他沙酮1的先前已知的A- rac和B- rac多晶型物外,还获得并研究了对映纯A-(S)-形式。根据X射线分析,该形式的晶体组织接近A- rac - 1多晶型物。美他沙酮熔体的结晶伴随着先前未知的亚稳态C相的形成,在外消旋和对映异构体样品的情况下,其均被转化为A- rac - 1或A-(S)-1。晶体样品的PXRD和IR光谱分析表明,A-(S)-1,A- rac - 1,C-(S)-1和C- rac - 1的结晶形式,以及所有这些相与B- rac - 1的本质区别。根据热化学数据,在从熔点到20°C的区间内绘制了所有研究相的吉布斯自由能变化的依赖性。在标准条件下,美他沙酮,相对于Δ的结晶变体,G ^ 0,形成这样的系列:B-外消旋- 1