The Synthesis of α-Cephalins by a New Procedure*

SYNTHESIS OF PHOSPHOLIPID METABOLITES L-ALPHA-GLYCERYLPHOSPHORYL-2-AMINO-2-METHYLPROPANOL

A constituent of and possible intermediate in the metabolism of phosphatidyl-2-amino-2-methylpropanols has been synthesized. The fatty-acid-free moiety, i.e. L-α-glycerylphosphoryl-2-amino-2-methylpropanol, was obtained by phosphorylating D-acetone glycerol with phosphorus oxychloride and quinoline, esterifying the acetone L-α-glycerylphosphoric acid dichloride with N-carbobenzoxy-2-amino-2-methylpropanol in the presence of pyridine, removing the acetone group of acetone L-α-glycerylphosphoryl-N-carbobenzoxy-2-amino-2-methylpropanol by mild acid hydrolysis, and freeing the barium salt of L-α-glycerylphosphoryl-N-carbobenzoxy-2-amino-2-methylpropanol from its protective carbobenzoxy group by catalytic hydrogenolysis.

The total synthesis of dilinoleoylphosphatidylserine and its activity in blood clotting systems

A total synthesis ofDL: -phosphatidyl-(dilinoleoyl)-L: -serine was achieved by the acylation of the barium salt of the phthalimidomethyl ester of glycerophosphoryl-N: -anisyloxycarbonyl-L: -serine. The dilinoleoyl intermediate was treated with hydrazine to remove the phthalimidomethyl group and with hydrogen chloride to remove the anisyloxycarbonyl protecting group. The resulting phosphatidylserine was purified by Rouser's methods, solubilized, and tested for biological activity in the antithromboplastin, recalcification, and Hicks-Pitney tests. It was found to have about the same anticoagulant activity as beef brain phosphatidylserine and hence was more active than the less unsaturated phosphatidylserine synthesized earlier.