Structure-based design, synthesis, and biological evaluation of potent and selective macrocyclic checkpoint kinase 1 inhibitors - PubMed (original) (raw)

. 2007 Apr 5;50(7):1514-27.

doi: 10.1021/jm061247v. Epub 2007 Mar 13.

Le Wang, Kent D Stewart, Zehan Chen, Wendy Gu, Mai-Ha Bui, Philip Merta, Haiying Zhang, Peter Kovar, Eric Johnson, Chang Park, Russell Judge, Saul Rosenberg, Thomas Sowin, Nan-Horng Lin

Affiliations

Structure-based design, synthesis, and biological evaluation of potent and selective macrocyclic checkpoint kinase 1 inhibitors

Zhi-Fu Tao et al. J Med Chem. 2007.

Abstract

Based on the crystallographic analysis of a urea-checkpoint kinase 1 (Chk1) complex and molecular modeling, a class of macrocyclic Chk1 inhibitors were designed and their biological activities were evaluated. An efficient synthetic methodology for macrocyclic ureas was developed with Grubbs metathesis macrocyclization as the key step. The structure-activity relationship studies demonstrated that the macrocyclization retains full Chk1 inhibition activity and that the 4-position of the phenyl ring can tolerate a wide variety of substituents. These novel Chk1 inhibitors exhibit excellent selectivity over a panel of more than 70 kinases. Compounds 5b, 5c, 5f, 15, 16d, 17g, 17h, 17k, 18d, and 22 were identified as ideal Chk1 inhibitors, which showed little or no single-agent activity but significantly potentiate the cytotoxicities of the DNA-damaging antitumor agents doxorubicin and camptothecin. These novel Chk1 inhibitors abrogate the doxorubicin-induced G2 and camptothecin-induced S checkpoint arrests, confirming that their potent biological activities are mechanism-based through Chk1 inhibition.

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