Synthesis, crystal structure, and absolute configuration of the enantiomers of chiral drug xibenolol hydrochloride
作者:Alexander A. Bredikhin、Zemfira A. Bredikhina、Alexey V. Kurenkov、Aidar T. Gubaidullin
DOI:10.1016/j.tetasy.2017.08.013
日期:2017.10
Based on the features of its crystallization, racemic 3-(2,3-dimethylphenoxy)propane-1,2-diol 2, the synthetic precursor of the chiral drug xibenolol 1, was resolved into pure enantiomers by the direct method of entrainment. The enantiomers of diol 2 through a Mitsunobu reaction were converted into the nonracemic 1,2-epoxy-3-(2,3-dimethylphenoxy)propanes (S)- and (R)-3, and then into the xibenolol enantiomers. Single crystals of (+)- and (-)-1 center dot HCl were studied by X-ray diffraction. On the basis of the Flack parameter, the absolute (R)- and (S)-configurations were assigned to these compounds and to the other intermediate chiral substances. (C) 2017 Elsevier Ltd. All rights reserved.