Method for preparing 2-hydroxy-6-ureidocarbonyl naphthalene derivative
View Patent ↗Disclosed is a method for preparing a 2-hydroxy-6-ureidocarbonyl naphthalene derivative. The method comprises the step of reacting 2-hydroxy-6-aminocarbonyl naphthalene and a isocyanate in an organic solvent at a temperature of 90–200° C. According to the present invention, 2-hydroxy-6-ureidocarbonyl naphthalene derivative can easily be obtained within relatively short time and high yield.
1. A method for manufacturing a 2-hydroxy-6-ureidocarbonyl naphthalene derivative, which comprises the step of reacting a 2-hydroxy-6-aminocarbonyl naphthalene derivative represented by formula [1]:
wherein X is hydrogen atom, cyano group or a group represented by formula [2], [3] or [4] below:
—CONH—X 1 [2]
wherein X 1 is selected from the group consisting of an optionally branched and optionally substituted C1–20 aliphatic hydrocarbon group which may have unsaturated bond(s), an optionally substituted aromatic group and an optionally substituted heterocyclic group having conjugated double bonds;
—CO—O—X 2 [3]
wherein X 2 is an optionally branched C1–6 aliphatic hydrocarbon group which may have unsaturated bond(s);
wherein A is selected from the group consisting of an optionally substituted aromatic group and an optionally substituted heterocyclic group having conjugated double bonds, and
Z is selected from the group consisting of —O—, —S— and —NH—;
Q is selected from the group consisting of optionally branched C1–6 alkyl and alkoxy groups, halogen atom, nitro group and nitroso group;
n is an integer of 0–3; and
R 1 is selected from the group consisting of hydrogen atom, C1–6 alkyl, C2–6 acyl and phenylalkyl groups,
with a isocyanate represented by formula [5]:
OCN—Y [5]
wherein Y is selected from the group consisting of an optionally substituted aromatic group and an optionally substituted heterocyclic group having conjugated double bonds,
in an organic solvent at a temperature of 90–200° C. to give the 2-hydroxy-6-ureidocarbonyl naphthalene derivative represented by formula [6]:
wherein X, Q, n, R 1 and Y are the same as defined above.
2. The method of claim 1 , wherein R 1 is C2–6 acyl group, X is hydrogen atom and n is 0.
3. The method of claim 1 , wherein the organic solvent is selected from the group consisting of toluene, xylene, mesitylene, nitrobenzene and chlorobenzene.
4. The method of claim 2 , wherein the organic solvent is selected from the group consisting of toluene, xylene, mesitylene, nitrobenzene and chlorobenzene.