Proline isosteres in a series of 2,4-disubstituted pyrrolo[1,2-f][1,2,4]triazine inhibitors of IGF-1R kinase and IR kinase.
Sampognaro A.J., Wittman M.D., Carboni J.M., Chang C., Greer A.F., Hurlburt W.W., Sack J.S., Vyas D.M.
Pyrrolidine, pyrrolidinone, carbocyclic, and acyclic groups were used as isosteric proline replacements in a series of insulin-like growth factor I receptor kinase/insulin receptor kinase inhibitors. Examples that were similar in potency to proline-containing reference compounds were shown to project a key fluoropyridine amide into a common space, while less potent compounds were not able to do so for reasons of stereochemistry or structural rigidity.
Bioorg. Med. Chem. Lett. 20:5027-5030(2010) [PubMed] [Europe PMC]