Novel heterocyclic compounds of the formula (I), in which R.sup.1, D, W, T and T' have the meanings indicated in Claim 1, are SGK inhibitors and can be used for the treatment of SGK-induced diseases and conditions, such as diabetes, obesity, metabolic syndrome (dyslipidaemia), systemic and pulmonary hypertonia, cardiovascular diseases and kidney diseases, generally in fibroses and inflammatory processes of any type.