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Aminoquinoline Melanin-Concentrating Hormone 1-Receptor (MCH1-R) Antagonists

[ Vol. 7 , Issue. 15 ]

Author(s):

Robert J. DeVita   Pages 1433 - 1439 ( 7 )

Abstract:


Structure-activity relationships of a 4-aminoquinoline MCH-1R antagonist lead series were explored by synthesis of analogs with modifications at the 2-, 4- and 6-positions of the original HTS hit. Improvements to the original screening lead were made by addition of lipophilic groups at the 2-position and biphenyl, cyclohexyl phenyl and hydrocinnamyl carboxamides at the 6-position. Viable modifications of the 4-amino group were limited and did not allow further optimization of the physical-chemical properties of this class of compounds. Transposition of the 4-amino group to the 2-position of the quinoline core structure provided the 2-aminoquinoline lead class with similar MCH1R binding affinity. A series of 2-aminoquinoline compounds was prepared and evaluated in MCH-1R binding and functional antagonist assays. Small dialkyl, methylalkyl, methylcycloalkyl and cyclic amines along with 3-substituted pyrrolidines were tolerated at the quinoline 2-position. The in vivo efficacy of compound A was explored and compared to that of a related inactive compound B to determine their effects on food intake and body weight in rodents. The biological activities of this matched active – inactive pair provide in vivo proof of concept in rodents that antagonism of MCH1R by a 2-aminoquinoline MCH1R antagonist which led to a reduction of food intake in an acute feeding assay paradigm.

Keywords:

Agonist, antagonist, G-protein coupled receptor, Melanin-concentrating hormone, obesity

Affiliation:

Department of Medicinal Chemistry, Merck Research Laboratories, P.O. Box 2000, RY121E-22,Rahway, N.J. 07065-0900 USA.



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