[CH:1]#[C:2][CH:3](O)[CH2:4][CH2:5][CH2:6][CH2:7][CH3:8].[NH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.Cl.NC1C=CC=CC=1>[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[Ru].[Ru].[Ru].C(OCC)C>[CH3:1][C:2]1[NH:10][C:11]2[C:16]([C:3]=1[CH2:4][CH2:5][CH2:6][CH2:7][CH3:8])=[CH:15][CH:14]=[CH:13][CH:12]=21-Octyne-3-ol (1.136 g, 9 mmol), aniline (0.559 g, 6 mmol), Ru3(CO)12 (16.0 mg, 0.025 mmol) and aniline hydrochloride (0.130 g, 1.0 mmol) were placed in a 10 ml round-bottomed flask, and the mixture was stirred at 140° C. for 9 hours. After cooling, diethyl ether (3 mL) was added, and the organic layer was washed twice with 1 M hydrochloric acid (2 mL) and once with water (2 mL). The organic layer was dried over sodium sulfate, and the solvent was distilled away, whereby an 11:1 mixture of 3-methyl-2-pentyl indole and 2-methyl-3-pentyl indole (1.262 g; 6.3 mmol; yield, 95%; purity, about 95% or more) was obtained.
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