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- Title
Hybrids of Salicylalkylamides and Mannich Bases: Control of the Amide Conformation by Hydrogen Bonding in Solution and in the Solid State.
- Authors
Dank, Christian; Kirchknopf, Barbara; Mastalir, Matthias; Kählig, Hanspeter; Felsinger, Susanne; Roller, Alexander; Arion, Vladimir B.; Gstach, Hubert
- Abstract
3-Aminomethylation of salicylalkylamides afforded hybrids with a Mannich base. In addition, it triggered the rotation of the amide bond. The observed conformational switch is driven by strong intramolecular hydrogen bonding between the Mannich base and phenolic group. Crystal structure analysis reveals the stabilization of the hybrid molecules by double hydrogen bonding of the phenolic OH, which acts as an acceptor and donor simultaneously. The molecules contain an amide site and a Mannich base site in an orthogonal spatial arrangement. The intramolecular hydrogen bonds are persistent in a nonpolar solvent (e.g., chloroform). The conformational change can be reversed upon protection or protonation of the Mannich base nitrogen.
- Subjects
AMIDE synthesis; HYDROGEN bonding interactions; CRYSTAL structure research; CHLOROFORM; NITROGEN spectra
- Publication
Molecules, 2015, Vol 20, Issue 1, p1686
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules20011686