Usefulness of the phthalimidomethyl group for the reversible protection of carboxyl functions

Synthesis of 7200 small molecules based on a substructural analysis of the histone deacetylase inhibitors trichostatin and trapoxin

Seventy-two hundred potential inhibitors of the histone deacetylase (HDAC) enzyme family, based on a 1,3-dioxane diversity structure, were synthesized on polystyrene macrobeads. The compounds were arrayed for biological assays in a "one bead-one stock solution" format. Metal-chelating functional groups were used to direct the 1,3-dioxanes to HDAC enzymes, which are zinc hydrolases. Representative structures from this library were tested for inhibitory activity and the 1,3-dioxane structure was shown to be compatible with HDAC inhibition. [structure: see text]

Liquid-liquid extraction in peptide synthesis

An efficient procedure of peptide synthesis in solution based on liquid-liquid extraction for the purification of intermediates (two-phase method) is described. Generally, peptide segments of 10 and in favorable cases 15 amino acids can be prepared by using conventional blocking groups. Special blocking groups adapted for optimal performance are discussed. Simple equipment enabling rapid synthesis is also described.

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.