Method for producing (R)-1,1,3-trimethyl-4-aminoindane

1. A method for producing (R)-1,1,3-trimethyl-4-aminoindane, comprising the following steps (A), (B), and (C):

(A): a step of optically resolving 1,1,3-trimethyl-4-aminoindane to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane;

(B): a step of racemizing the (S)-1,1,3-trimethyl-4-aminoindane obtained in the step (A) or (C) to obtain 1,1,3-trimethyl-4-aminoindane; and

(C): a step of optically resolving the 1,1,3-trimethyl-4-aminoindane obtained in the step (B) to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane.

2. The production method according to claim 1 , wherein the steps (B) and (C) are repeated.

3. The production method according to claim 1 , wherein the step (C) is a step of optically resolving the 1,1,3-trimethyl-4-aminoindane obtained in the step (B) and the 1,1,3-trimethyl-4-aminoindane obtained in a step other than the step (B) to obtain (R)-1,1,3-trimethyl-4-aminoindane.

4. The production method according to claim 1 , comprising the following steps (A), (B′), (D), and (E):

(A): a step of optically resolving 1,1,3-trimethyl-4-aminoindane to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane;

(B′): a step of racemizing the (S)-1,1,3-trimethyl-4-aminoindane obtained in the step (A) or (E) to obtain 1,1,3-trimethyl-4-aminoindane;

(D): a step of purifying the 1,1,3-trimethyl-4-aminoindane obtained in the step (B′); and

(E): a step of optically resolving the 1,1,3-trimethyl-4-aminoindane obtained in the step (D) to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane.

5. The production method according to claim 4 , wherein the steps (B′), (D), and (E) are repeated.

6. The production method according to claim 1 , wherein the step (B) or (B′) is a step of bringing the (S)-1,1,3-trimethyl-4-aminoindane obtained in the step (A) into contact with a transition metal catalyst to perforin racemization.

7. The production method according to claim 1 , wherein the step (A) is a step comprising the following steps (A1), (A2), (A3), and (A4):

(A1): a step of mixing 1,1,3-trimethyl-4-aminoindane with D-tartaric acid and methanol to obtain a mixture including a methanol solvate of D-tartrate of (R)-1,1,3-trimethyl-4-aminoindane and D-tartrate of (S)-1,1,3-trimethyl-4-aminoindane;

(A2): a step of separating a solution containing D-tartrate of (S)-1,1,3-trimethyl-4-aminoindane and the methanol solvate of D-tartrate of (R)-1,1,3-trimethyl-4-aminoindane from the mixture obtained in the step (A1);

(A3): a step of mixing the methanol solvate of D-tartrate of (R)-1,1,3-trimethyl-4-aminoindane obtained in the step (A2) and an aqueous alkali metal hydroxide solution or aqueous alkali metal carbonate solution to obtain (R)-1,1,3-trimethyl-4-aminoindane; and

(A4): a step of mixing the solution including the D-tartrate of (S)-1,1,3-trimethyl-4-aminoindan obtained in the step (A2) and an aqueous alkali metal hydroxide solution or aqueous alkali metal carbonate solution to obtain (S)-1,1,3-trimethyl-4-aminoindane.

8. The production method according to claim 7 , wherein water is mixed into the reaction system prior to the step (A2).

9. The production method according to claim 4 , wherein the step (D) is a step comprising the following steps (D1), (D2), (D3), and (D4):

(D1): a step of reacting the 1,1,3-trimethyl-4-aminoindane obtained in the step (B′) with hydrogen hydride in the presence of water and a water-insoluble organic solvent;

(D2): a step of separating a layer dissolving therein a hydrogen halide salt of 1,1,3-trimethyl-4-aminoindane included in the mixture obtained in the step (D1) from other layer;

(D3): a step of precipitating the hydrogen halide salt of 1,1,3-trimethyl-4-aminoindane from the layer dissolving therein the hydrogen halide salt of 1,1,3-trimethyl-4-aminoindane obtained in the step (D2); and

(D4): a step of withdrawing the hydrogen halide salt of 1,1,3-trimethyl-4-aminoindane obtained in the step (D3) and reacting thus obtained hydrogen halide salt with a base.

10. The production method according to claim 9 , wherein the hydrogen halide is hydrogen chloride.

11. A method for producing a compound represented by the following formula (1):

wherein R 1 and R 2 each independently represent an alkyl group which may be substituted with a halogen atom, or a hydrogen atom), comprising the following steps (A), (B), (C), and (F):

(A): a step of optically resolving 1,1,3-trimethyl-4-aminoindane to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane;

(B): a step of racemizing the (S)-1,1,3-trimethyl-4-aminoindane obtained in the step (A) or (C) to obtain 1,1,3-trimethyl-4-aminoindane;

(C): a step of optically resolving the 1,1,3-trimethyl-4-aminoindane obtained in the step (B) to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane; and

(F): a step of reacting the (R)-1,1,3-trimethyl-4-aminoindane obtained in the step (C) with a compound represented by the formula (2) to obtain a compound represented by the formula (1):

wherein R 1 and R 2 represent the same meanings as above, and R 3 represents a halogen atom, a hydroxyl group, or an alkoxy group which may be substituted with a halogen atom.

12. A method for producing a compound represented by the following formula (1):

wherein R 1 and R 2 each independently represent an alkyl group which may be substituted with a halogen atom, or a hydrogen atom), comprising the following steps (A), (B), (C), (G), and (H):

(A): a step of optically resolving 1,1,3-trimethyl-4-aminoindane to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane;

(B): a step of racemizing the (S)-1,1,3-trimethyl-4-aminoindane obtained in the step (A) or (C) to obtain 1,1,3-trimethyl-4-aminoindane;

(C): a step of optically resolving the 1,1,3-trimethyl-4-aminoindane obtained in the step (B) to obtain (R)-1,1,3-trimethyl-4-aminoindane and (S)-1,1,3-trimethyl-4-aminoindane;

(G): a step of obtaining a compound represented by the formula (4) from a compound represented by the formula (3):

wherein R 1 and R 2 represent the same meanings as above

wherein R 1 and R 2 represent the same meanings as above; and

(H): a step of reacting the compound represented by the formula (4) obtained in the step (G) with the (R)-1,1,3-trimethyl-4-aminoindane obtained in the step (C) in the presence of a base to obtain the compound represented by the formula (1).

13. The production method according to claim 11 , wherein R 1 is a hydrogen atom or a methyl group, and R 2 is a methyl group, a monofluoromethyl group, a difluoromethyl group, or a trifluoromethyl group.