Aniline → 2'-Methylspiro[cyclohexane-1,3'-indole]

Participants

Reaction Conditions

Reaction Steps

1-Ethynyl-1-cyclohexanol (1.242 g, 10 mmol), aniline (0.931 g, 10 mmol), Ru3(CO)12 (32.0 mg, 0.05 mmol) and aniline hydrochloride (0.259 g, 2.0 mmol) were placed in a 10 ml round-bottomed flask, and the mixture was stirred at 120° C. for 12 hours. After cooling, dichloromethane (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 2-methyl-3H-indole-3-spiro-1′-cyclohexane (24 mg; 0.12 mmol; yield, 1.2%; purity, 95% or more) was obtained.

Provenance & Evidence