The present invention discloses compounds of formula I ##STR00001## wherein Ar, Y, m, n, R.sup.1 and R.sup.4 are herein defined, said compounds being novel antagonists for melanin-concentrating hormone (MCH), as well as methods for preparing such compounds. In another embodiment, the invention discloses pharmaceutical compositions comprising such MCH antagonists as well as methods of using them to treat obesity, metabolic disorders, eating disorders such as hyperphagia, and diabetes.