Five-membered heterocyclic ureas suitable for the donor–donor–acceptor hydrogen-bonding modules
Tetrahedron Letters, ISSN: 0040-4039, Vol: 49, Issue: 12, Page: 2005-2009
2008
- 18Citations
- 13Captures
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Article Description
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 CH c ⋯O and their conformational equilibriums are biased toward the stable folded conformer.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0040403908001160; http://dx.doi.org/10.1016/j.tetlet.2008.01.068; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=39249085351&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0040403908001160; https://dx.doi.org/10.1016/j.tetlet.2008.01.068
Elsevier BV
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