Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
4 years ago

Medium-Sized-Ring Analogues of Dibenzodiazepines by a Conformationally Induced Smiles Ring Expansion

Medium-Sized-Ring Analogues of Dibenzodiazepines by a Conformationally Induced Smiles Ring Expansion
Romain Costil, Jonathan Clayden, Quentin Lefebvre
Analogues of dibenzodiazepines, in which the seven-membered nitrogen heterocycle is replaced by a 9–12-membered ring, were made by an unactivated Smiles rearrangement of five- to eight-membered heterocyclic anthranilamides. The conformational preference of the tertiary amide in the starting material leads to intramolecular migration of a range of aryl rings, even those lacking electron-withdrawing activating groups, and provides a method for nn+4 ring expansion. The medium-ring products adopt a chiral ground state with an intramolecular, transannular hydrogen bond. The rate of interconversion of their enantiomeric conformers depends on solvent polarity. Ring size and adjacent steric hindrance modulate this hidden hydrophilicity, thus making this scaffold a good candidate for drug development. Smiles rearrangement of readily prepared amide derivatives of benzo-fused nitrogen heterocycles requires no electronic activation to give medium-sized-ring analogues of the dibenzodiazepine tricyclic antidepressants.⋅The reaction tolerates electron-rich and electron-poor rings, delivers 9-12-membered rings, and leads to conformationally restricted products

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201708991

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