A compound of formula: wherein R 1 is selected from C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 3 -C 15 arylalkyl and C 3 -C 15 heteroarylalkyl; R 2 is selected from hydrogen, C 1 -C 6 alkyl and C 2 -C 6 alkenyl; wherein each R 3 is independently selected from the group consisting of: C 2 -C 15 heterocyclyl, C 3 -C 15 heteroaryl, C 3 -C 15 heterocyclylalkyl, C 1 -C 6 alkyl, optionally substituted with - N(R 7) (R 8), C R 7, a 5 or 6-membered heterocycle, 5 or 6-membered heteroaryl, -OR 7; - OR 5, - C R 5, - C N(R 5) (R 6), and - N(R 5) (R 6), R 5 and R 6 are independently selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 2 -C 15 heterocyclyl, C 3 -C 15 arylalkyl, C 3 -C 15 heteroarylalkyl, -S 2 R 9, -N (R 3); R 9 is independently selected from the group consisting of C 1 -C 3 alkyl, C 6 -C 10 aryl, C 7 -C 11 arylalkyl and an amino acid; each of these groups being able to be optionally substituted with a group which is selected from C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, -OR 7, -SR 7, -S R 7, -S 2 R 7, -OS 2 R 7, - N(R 7) (R 8), C R 7, -C OR 8, -C N(R 7) (R 8), -OC R 7 and - N(R 7)C R 8; R 7 and R 8 being independently selected from the group consisting of C 1 -C 3 alkyl, C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 2 -C 15 heterocyclyl, C 3 -C 15 arylalkyl, C 3 -C 15 heteroarylalkyl, C 3 -C 15 heterocyclylalkyl; optionally substituted with C 1 -C 3 alkyl, C 1 -C 3 haloalkyl or -O-(C 1 -C 3) alkyl; y is 1, 2, 3, 4 or 5; and or a pharmaceutically acceptable solvate or salt thereof, for use in the prevention and/or the treatment of a disease in which the GLP-1 receptor participates or mediates which is an eating disorder or disease selected from the list comprising: obesity, anorexia, lipid dysfunction, diabetes, hyperinsulinism and cardiovascular diseases and metabolic syndrome. R 1 is selected from C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 3 -C 15 arylalkyl and C 3 -C 15 heteroarylalkyl; R 2 is selected from hydrogen, C 1 -C 6 alkyl and C 2 -C 6 alkenyl; wherein each R 3 is independently selected from the group consisting of: C 2 -C 15 heterocyclyl, C 3 -C 15 heteroaryl, C 3 -C 15 heterocyclylalkyl, C 1 -C 6 alkyl, optionally substituted with - N(R 7) (R 8), C R 7, a 5 or 6-membered heterocycle, 5 or 6-membered heteroaryl, -OR 7; - OR 5, - C R 5, - C N(R 5) (R 6), and - N(R 5) (R 6), R 5 and R 6 are independently selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 2 -C 15 heterocyclyl, C 3 -C 15 arylalkyl, C 3 -C 15 heteroarylalkyl, -S 2 R 9, -N (R 3); C 2 -C 15 heterocyclyl, C 3 -C 15 heteroaryl, C 3 -C 15 heterocyclylalkyl, C 1 -C 6 alkyl, optionally substituted with - N(R 7) (R 8), C R 7, a 5 or 6-membered heterocycle, 5 or 6-membered heteroaryl, -OR 7; - OR 5, - C R 5, - C N(R 5) (R 6), and - N(R 5) (R 6), R 5 and R 6 are independently selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 2 -C 15 heterocyclyl, C 3 -C 15 arylalkyl, C 3 -C 15 heteroarylalkyl, -S 2 R 9, -N (R 3); - OR 5, - C R 5, - C N(R 5) (R 6), and - N(R 5) (R 6), R 5 and R 6 are independently selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 2 -C 15 heterocyclyl, C 3 -C 15 arylalkyl, C 3 -C 15 heteroarylalkyl, -S 2 R 9, -N (R 3); R 9 is independently selected from the group consisting of C 1 -C 3 alkyl, C 6 -C 10 aryl, C 7 -C 11 arylalkyl and an amino acid; each of these groups being able to be optionally substituted with a group which is selected from C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, -OR 7, -SR 7, -S R 7, -S 2 R 7, -OS 2 R 7, - N(R 7) (R 8), C R 7, -C OR 8, -C N(R 7) (R 8), -OC R 7 and - N(R 7)C R 8; R 7 and R 8 being independently selected from the group consisting of C 1 -C 3 alkyl, C 6 -C 15 aryl, C 3 -C 15 heteroaryl, C 2 -C 15 heterocyclyl, C 3 -C 15 arylalkyl, C 3 -C 15 heteroarylalkyl, C 3 -C 15 heterocyclylalkyl; optionally substituted with C 1 -C 3 alkyl, C 1 -C 3 haloalkyl or -O-(C 1 -C 3) alkyl; y is 1, 2, 3, 4 or 5; and