Phosphatidic acids and derivatives. IX. A new synthesis of glycolkephalins and glycerol‐α‐kephalins

Abstract
A new synthesis of glycerol‐α‐kephalins and glycolkephalins is described. The corresponding silver benzyl diacylglycerol‐α‐phosphate or silver benzyl glycolphosphate is boiled in benzene solution with 2‐(dibenzylamino)ethyl bromide, and the O,N,N‐tribenzyl derivative of the kephalin thus obtained is converted into the kephalin by hydrogenolysis. The overall yields are 80‐90 %.