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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Lead optimization of [(S)-gamma-(arylamino)prolyl]thiazolidine focused on gamma-substituent: Indoline compounds as potent DPP-IV inhibitors.

Dipeptidyl peptidase IV (DPP-IV) inhibitors are looked to as a potential new antidiabetic agent class. A series of [(S)-gamma-(arylamino)prolyl]thiazolidine compounds in which the electrophilic nitrile is removed are chemically stable DPP-IV inhibitors. To discover a structure for the gamma-substituent of the proline moiety more suitable for interacting with the S(2) pocket of DPP-IV, optimization focused on the gamma-substituent was carried out. The indoline compound 22e showed a DPP-IV-inhibitory activity 100-fold more potent than that of the prolylthiazolidine 10 and comparable to that of NVP-DPP728. It also displayed improved inhibitory selectivity for DPP-IV over DPP8 and DPP9 compared to compound 10. Indoline compounds such as 22e have a rigid conformation with double restriction of the aromatic moiety by proline and indoline structures to promote interaction with the binding site in the S(2) pocket of DPP-IV. The double restriction effect provides a potent inhibitory activity which compensates for the decrease in activity caused by removing the electrophilic nitrile.[1]

References

  1. Lead optimization of [(S)-gamma-(arylamino)prolyl]thiazolidine focused on gamma-substituent: Indoline compounds as potent DPP-IV inhibitors. Sakashita, H., Akahoshi, F., Yoshida, T., Kitajima, H., Hayashi, Y., Ishii, S., Takashina, Y., Tsutsumiuchi, R., Ono, S. Bioorg. Med. Chem. (2007) [Pubmed]
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