Synthesis and crystal structures of 7-bromo-5-(2′-chloro)phenyl-3-hydroxy-1-methyl-1,2-dihydro-3H-1,4-benzodiazepin-2-one and 7-bromo-5-(2′-chloro)phenyl-1-hexyl-1,2,4,5-tetrahydro-3H-1,4-benzodiazepin-2,3-dione
作者:Victor Ch. Kravtsov、Marina S. Fonari、Мaria Gdaniec、Victor I. Pavlovsky、Sergei A. Andronati、Ekaterina A. Semenishyna
DOI:10.1016/j.molstruc.2012.02.071
日期:2012.6
Treatment of 7-bromo-5-(2'-chloro)phenyl-3-hydroxy-1,2-dihydro-3H-1,4-benzodiazepin-2-one (1) with methyl or hexyl tosylate resulted in 7-bromo-5-(2'-chloro)phenyl-3-hydroxy-1-methyl-1,2-dihydro-3H-1,4-benzodiazepin-2-one (2) and 7-bromo-5-(2'-chloro)phenyl-1-hexyl-1,2,4,5-tetrahydro-3H-1,4-benzodiazepin-2,3-dione (3). As confirmed by X-ray crystallography, the two products differ not only in the identity of the alkyl substituent in position 1 of the benzodiazepine fragment but also crystallize in different molecular forms resulting from proton migration. This alteration of the molecular structure leads to a significant change in the conformation of the central molecular fragment and influences the assembly mode in the crystal. In 3, centrosymmetric dimers formed via a pair of N-H center dot center dot center dot O hydrogen bonds are further linked into chains via C-Br center dot center dot center dot O=C halogen bond interaction. In turn in 2 there are two symmetry independent molecules, each giving a different set of intermolecular interactions. One of the molecules forms a dimer via O-H center dot center dot center dot O interactions whereas the second one generates chain via C-Br center dot center dot center dot O=C halogen bond that is also assisted by a weak O-H center dot center dot center dot Br hydrogen bond. (C) 2012 Elsevier B.V. All rights reserved.