The present invention relates to novel 2-(6-oxo-1,7-diaza-spiro[4.4]non-7-yl)-propionamides of the formula ##STR00001## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, m and p are as defined in the specification, to their preparation, to their use as pharmaceuticals and to pharmaceutical compositions containing them.