Disclosed are the novel compounds as
growth hormone secretagogues represented by
structural Formula (I), wherein R1 is, substituted or unsubstituted
alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted
aryl, or substituted or unsubstituted amino, X is —CO— or —SO2—, Y is Formula (II), wherein n is an integer from 0–4, R4 is
hydrogen, substituted or unsubstituted
alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted
aryl, R5 and R6 are independently selected from
hydrogen, substituted or unsubstituted
alkyl, or R5 and R6 or R4 and R5 are taken together to form substituted or unsubstituted alkylene, R2 is
hydrogen, or substituted or unsubstituted alkyl, R3 is substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted
aryl, D is substituted or unsubstituted amino, substituted or unsubstituted alkoxy, or substituted or unsubstituted alkylthio, * represents an asymmetric center, and pharmaceutically acceptable salts and individual isomers thereof, which have
growth hormone releasing activity in humans or animals.