The invention relates to acylamino-phthalic acid amides and related compounds of formula (I) wherein A is —CON—R3R4, —NR5COR6, —NHR7, —OR8, —SR9, —CH2NR10R11, —(CH2)2-R12, —CH═CH—R12, —C≡C—R12, optionally substituted phenyl, optionally substituted thiophenyl, or optionally substituted 1,2,3-triazol-4-yl, W is hydrogen, hydroxy or carboxymethoxy, Y is carboxy, methoxycarbonyl or 2H-tetrazol-5-yl, and the various substituents R have the meanings indicated in the description. These compounds are useful for the treatment and/or prophylaxis of skeletal muscle atrophy, schizophrenia and Alzheimer's disease, and as cognitive enhancers.