Discovery of cyclopentane- and cyclohexane- trans-1,3-diamines as potent melanin-concentrating hormone receptor 1 antagonists

The optimization of a HTS-derived lead compound into a potent and metabolically stable MCH-R1 antagonist is presented. We herein report the optimization of cyclopentane- and cyclohexane-1,3-diamine derivatives as novel and potent MCH-R1 antagonists. Structural modifications of the 2-amino-quinoline and thiophene moieties found in the initial lead compound served to improve its metabolic stability profile and MCH-R1 affinity, and revealed unprecedented SAR when compared to other 2-amino-quinoline-containing MCH-R1 antagonists.