Intramolecular rhodium-catalyzed activation of α-amino C–H bonds: decisive influence of conformational factors in the synthesis of bicyclic aminals from N-sulfamoyloxyacetyl azacycloalkanes
The activation of α-amino C–H bonds in azacycloalkanes by way of intramolecular rhodium-catalyzed amination is reported. In this study, the ‘activating’ sulfamoyloxy group is attached to the endocyclic nitrogen atom with an appropriate linker. The influence of various structural parameters was studied. Results obtained demonstrate the remarkable conformational control that is possible with such azacycloalkane
The concise synthesis of fused bicyclic aminals by way of intramolecular rhodium-catalyzed C-H amination is reported as well as the evaluation of their reactivity as iminium precursors. In contrast to the well-studied N,O-acetal systems, the aminals synthesized were found to be particularly stable under reaction conditions used for nucleophilic addition.