Es wird über die Synthese einer Reihe von N-Carbobenzoxy-aminosäuren und -peptidsäuren sowie Aminosäure- und Peptidbenzylester-Derivaten, die als Ausgangsprodukte zur Darstellung verschiedener Serinpeptide dienten, berichtet.
A synthesis of the hitherto unreported L-serylglycylglycine by two different methods is described. N-carbobenzoxy L-serylglycylglycine benzyl ester, an intermediate in the preparation of the tripeptide, was found to be a suitable derivative in the synthesis of L-α-phosphatidyl L-serylglycylglycine.
Analogues of [5-Leu]enkephalin, prolonged by methionine on the N-terminus or, by lysine or methionine on the C-terminus were prepared by fragment condensation, purified by ion exchange chromatography or high-pressure liquid chromatography. The substances were characterised by their opioid activity in a test on guinea-pig ileum in comparison with the activity of [5-Leu]enkephalin.