作者:Alexander A. Bredikhin、Zemfira A. Bredikhina、Alexey V. Kurenkov、Dmitry B. Krivolapov
DOI:10.1016/j.tetasy.2017.02.009
日期:2017.3
Racemic 3-(4-indolyloxy)-1,2-propanediol 2 has been effectively resolved into (S)- and (R)-enantiomers by a preferential crystallization procedure. Non-racemic (S)-2 was converted into (S)-4-(2,3-epoxypropoxy)-1H-indole (S)-4 via a Mitsunobu reaction and then into (S)-pindolol (S)-1. The crystalline (S)-1 was studied by single crystal X-ray diffraction. A large number of symmetry independent molecules (Z' = 6) led to a weakening of the system of strong intermolecular hydrogen bonds, which combined with a loose packing (PI = 64.6%), may be the cause of the abnormally low melting point of (S)-1 as compared with rac-1. (C) 2017 Elsevier Ltd. All rights reserved.