Small‐Molecule Recognition for Controlling Molecular Motion in Hydrogen‐Bond‐Assembled Rotaxanes

A Martinez‐Cuezva, J Berna, RA Orenes… - Angewandte …, 2014 - Wiley Online Library
Angewandte Chemie, 2014Wiley Online Library
Di (acylamino) pyridines successfully template the formation of hydrogen‐bonded rotaxanes
through five‐component clipping reactions. A solid‐state study showed the participation of
the pyridine nitrogen atom in the stabilization of the mechanical bond between the thread
and the benzylic amide macrocycle. The addition of external complementary binders to a
series of interlocked bis (2, 6‐di (acylamino) pyridines) promoted restraint of the back and
forward ring motion. The original translation can be restored through a competitive …
Abstract
Di(acylamino)pyridines successfully template the formation of hydrogen‐bonded rotaxanes through five‐component clipping reactions. A solid‐state study showed the participation of the pyridine nitrogen atom in the stabilization of the mechanical bond between the thread and the benzylic amide macrocycle. The addition of external complementary binders to a series of interlocked bis(2,6‐di(acylamino)pyridines) promoted restraint of the back and forward ring motion. The original translation can be restored through a competitive recognition event by the addition of a preorganized bis(di(acylamino)pyridine) that forms stronger ADA–DAD complexes with the external binders.
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