[Synthesis of N-(4-substituted amino-4-oxobutyryl)-N-substituted glycines]

Nine N-(4-substituted amino-4-oxobutyryl)-N-substituted glycines expected to have inhibitory activity on angiotensin-converting enzyme were synthesized. All of the title compounds and their t-butyl esters were unreported in the literature. In preliminary test in rats, compounds V2, V6 and V7 showed marked hypotensive activity.