Discovery and Evaluation of Potent P1 Aryl Heterocycle-Based Thrombin Inhibitors
摘要:
In an effort to discover potent, clinically useful thrombin inhibitors, a rapid analogue synthetic approach was used to explore the P-1 region. Various benzylamines were coupled to a pyridine/pyrazinone P-2-P-3 template. One compound with an o-thiadiazole benzylic substitution was found to have a thrombin K-i of 0.84 nM. A study of ortho-substituted five-membered-ring heterocycles was undertaken and subsequently demonstrated that the o-triazole and tetrazole rings were optimal. Combination of these potent P-1 aryl heterocycles with a variety of P-2-P-3 groups produced a compound with an extraordinary thrombin inhibitory activity of 1.4 pM. It is hoped that this potency enhancement in P-1 will allow for more diversification in the P-2-P-3 region to ultimately address additional pharmacological concerns.
Compounds of the invention are useful in inhibiting thrombin and associated thrombotic occlusions having the following structure:
1
wherein R
1
is, for example, hydrogen, Cl, or cyano, and R
2
is, for example, hydrogen,
2
[EN] THROMBIN INHIBITORS<br/>[FR] INHIBITEURS DE LA THROMBINE
申请人:MERCK & CO INC
公开号:WO2002064140A1
公开(公告)日:2002-08-22
Compounds of the invention are useful in inhibiting thrombin and associated thrombotic occlusions having the following structure: or a pharmaceutically acceptable salt thereof, wherein R2 is R3 is selected from the group consisting of 1) hydrogen, 2) halogen, 3) C 1-4 alkyl, 4) C 3-7 cycloalkyl, 5) CF3, 6) OCF3, 7) C 1-4 alkoxy, and 8) cyano; and R12 is a 5-membered heteroaryl ring having 2, 3, or 4 heteroatoms, provided that at least 1 heteroatom is N, and at most 1 of the heteroatoms is S, said ring being unsubstituted or substituted, at any one ring atom, with CH3.