Synthesis of Acid Addition Salt of Delta-Aminolevulinic Acid from 5-Bromo Levulinic Acid Esters
U.S. Patent 6,583,317
Technology Description A process of preparing an acid addition salt of delta-aminolevulinc acid comprising:a) dissolving a lower alkyl 5-bromolevulinate and hexamethylenetetramine in a solvent selected from the group consisting of water, ethyl acetate, chloroform, acetone, ethanol, tetrahydrofuran and acetonitrile, to form a quaternary ammonium salt of the lower alkyl 5-bromolevulinate; andb) hydrolyzing the quaternary ammonium salt with an inorganic acid to form an acid addition salt of delta-aminolevulinic acid.
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