A New Quadruple Hydrogen-Bonding Module with a DDAA Array: Formation of a Stable Homodimer without Competition from Undesired Hydrogen-Bonded Dimers
摘要:
A new DDAA hydrogen-bonding module (Ulmp-2), based on a ureidoimidazo[1,2-a]pyrimidine structure, forms a highly stable homodimer (K-dlm > 1.1 x 10(5) M-1 in CDCl3) without competition from undesired hydrogen-bonded dimers.
Five-membered heterocyclic ureas suitable for the donor–donor–acceptor hydrogen-bonding modules
摘要:
Five-membered heterocyclic ureas are capable of forming the unfolded conformer without preorganization by using the intramolecular hydrogen bond, and are suitable for the DDA hydrogen-bonding modules. In contrast, six-membered heterocyclic ureas are destabilized by an effect of steric repulsion due to the closer distance of CHc center dot center dot center dot O and their conformational equilibriums are biased toward the stable folded conformer. (c) 2008 Elsevier Ltd. All rights reserved.
Five-membered heterocyclic ureas are capable of forming the unfolded conformer without preorganization by using the intramolecular hydrogen bond, and are suitable for the DDA hydrogen-bonding modules. In contrast, six-membered heterocyclic ureas are destabilized by an effect of steric repulsion due to the closer distance of CHc center dot center dot center dot O and their conformational equilibriums are biased toward the stable folded conformer. (c) 2008 Elsevier Ltd. All rights reserved.
A New Quadruple Hydrogen-Bonding Module with a DDAA Array: Formation of a Stable Homodimer without Competition from Undesired Hydrogen-Bonded Dimers
A new DDAA hydrogen-bonding module (Ulmp-2), based on a ureidoimidazo[1,2-a]pyrimidine structure, forms a highly stable homodimer (K-dlm > 1.1 x 10(5) M-1 in CDCl3) without competition from undesired hydrogen-bonded dimers.