Observation of 3D isostructurality in halogen substituted N -benzoyl- N -phenylbenzamides
作者:Rahul Shukla、Susanta K. Nayak、Deepak Chopra、M. Kishore Reddy、T.N. Guru Row
DOI:10.1016/j.molstruc.2018.03.029
日期:2018.7
The occurrence of 3D isostructurality in six halogensubstituted N-benzoyl-N-phenylbenzamides has been reported and this feature has been quantitatively analyzed in this study. 4-fluoro-N-(4-fluorobenzoyl) N-(fluorphenyl)benzamide (1) was observed to be isostructural with 2-fluoro-N-(2fluorobenzoyl) N-(4-fluorophenyl)benzamide (7), N-(4-bromophenyI)-2-fluoro-N-(2-fluorobenzoyl) benzamide (8) and 2
The present invention provides compounds of Formula I,
1
including pharmaceutically acceptable salts and/or prodrugs thereof, where G, R
2
, and R
3
are defined as described herein.
本发明提供了公式I的化合物,包括其药学上可接受的盐和/或前药,其中G、R2和R3的定义如本文所述。
Role of Hetero-Halogen (F···X, X = Cl, Br, and I) or Homo-Halogen (X···X, X = F, Cl, Br, and I) Interactions in Substituted Benzanilides
作者:Susanta K. Nayak、M. Kishore Reddy、Tayur N. Guru Row、Deepak Chopra
DOI:10.1021/cg101544z
日期:2011.5.4
A series of halogen-substituted benzanilides have been synthesized and characterized, and crystallization studies directed toward generation of polymorphs have been performed to delineate the importance of interactions involving halogens. The effect of halogen substitution on the molecular conformation and supramolecular packing has been investigated. The N-H center dot center dot center dot O H-bond is a key structure-directing element acting in conjunction with C-H center dot center dot center dot O and C-H center dot center dot center dot pi interactions. In addition, it is of importance to note that organic fluorine prefers Type I F center dot center dot center dot F contacts, whereas Cl, Br, and I prefer Type II contacts. Hetero-halogen center dot center dot center dot halogen interactions on the other hand are predominately of Type II geometry, and this is due to the greater polarizability of the electron density associated with the heavier halogens. It is of importance to evaluate the contributing role of these interactions in crystal structure packing and the co-operativity associated with such interactions in the solid state.