Syntheses of γ-Oxo Acids or γ-Oxo Esters by Photooxygenation of Furanic Compounds and Reduction Under Ultrasound: Application to the Synthesis of 5-Aminolevulinic Acid Hydrochloride
A method of preparing an acid additional salt of delta-aminolevulinic acid
申请人:Japan Tobacco Inc.
公开号:EP0483714A1
公开(公告)日:1992-05-06
An acid addition salt of δ-aminolevulinic acid is prepared in such a way that tetrahydrofurfurylamine (VI) is reacted with phthalic anhydride under an anhydrous condition to introduce a phthal group which protects amino group of tetrahydrofurfurylamine to give N-tetrahydrofurfuryl phthalimide (III), carbon atoms of the first- and fourth-positions of thus obtained N-tetrahydrofurfurylphthalimide (III) are oxidized at 80°C using sodium periodate as a oxidizing agent and ruthenium chloride hydrate as a catalyst to yield 5-phthalimidolevulinic acid (II), then the protecting group of 5-phthalimidolevulinic acid (II) is deprotected using an acid to prepare an acid additional salt of δ-aminolevulinic acid. The acid additional salt of δ-aminolevulinic acid is readily converted by neutralization by an alkali to δ-aminolevulinic acid, which is very useful as a precursor of Vitamin B₁₂, heme and chlorophyll.