Jitsubo Co., Ltd.

Daisuke Kubo

Hideaki Suzuki

Shuji Fujita

Susumu Muto

The present invention has an object of shortening the process time and reducing use of a poor solvent for solidifying a carrier (Tag)-peptide component, by removing impurities without conducting solid-liquid separation (condensation, solid-liquid separation and drying operation) of a Tag-peptide component, in an Fmoc method using a Tag for liquid phase peptide synthesis. Provided is the peptide synthesis method that includes the following steps a-d: step a: a carrier-protected amino acid, carrier-protected peptide, or a carrier-protected amino acid amide, and an N-Fmoc-protected amino acid or an N-Fmoc-protected peptide are condensed in an organic solvent or a mixed solution of organic solvents, to obtain an N-Fmoc-carrier-protected peptide, step b: a water-soluble amine is added to the reaction solution after the condensation reaction, step c: the Fmoc group is deprotected from the protected amino group in the presence of a water-soluble amine, and step d: the reaction solution is neutralized by adding an acid, and further, by adding and washing with an acidic aqueous solution, then, by liquid-liquid separation an aqueous layer is removed to obtain an organic layer.

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Kanagawa, Japan

Daisuke Kubo