Production method for dihydroxyindoles
AssigneeKao Corporation
InventorsMasayoshi Nakamoto, Norihiro Ito
Life of this patent
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Abstract
A method for producing dihydroxyindoles includes: a step 1 of obtaining an aqueous first solution including dihydroxyindoles obtained by causing at least a material selected from the group consisting of 3-(3,4-dihydroxyphenyl)alanine and a derivative of 3-(3,4-dihydroxyphenyl)alanine to react with an oxidizing agent; and a step 2 of obtaining an oleaginous second solution in which the dihydroxyindoles are extracted in an extraction solvent by mixing the first solution obtained in the step 1 with the extraction solvent. Before the first solution obtained in the step 1 is mixed with the extraction solvent in the step 2, a water-insoluble by-product is removed from the first solution.
Claims16
A method for producing dihydroxyindoles, comprising:
- a step 1 of obtaining an aqueous first solution including dihydroxyindoles obtained by causing at least a material selected from the group consisting of 3-(3,4-dihydroxyphenyl)alanine and a derivative of 3-(3,4-dihydroxyphenyl)alanine to react with an oxidizing agent;
- and
- a step 2 of obtaining an oleaginous second solution in which the dihydroxyindoles are extracted in an extraction solvent by mixing the first solution obtained in the step 1 with the extraction solvent, wherein
- before the first solution obtained in the step 1 is mixed with the extraction solvent in the step 2, a water-insoluble by-product is removed from the first solution.
Dependencies are inferred from the claim text.