Methylamine → rac-(1R,2R)-2-(methylamino)cyclohexan-1-ol

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Reaction Steps

Cyclohexene oxide (202 mL, 2 mol) was added dropwise to aqueous methyl amine (466 mL or 40% solution, 6 mol) over 70 minutes. After a further 90 minutes, the temperature of the reaction mixture was 48° C. and was reduced to 30° C. by cooling in a water bath. After a further 2 hours, the mixture had returned to room temperature. It was stirred overnight, and then refluxed for 3 h. The mixture was saturated with sodium hydroxide (cooled during addition), extracted several times with diethyl ether (total 500 mL), the diethyl ether layer dried over sodium sulphate overnight, and the diethyl ether removed on a rotary evaporator. The remaining diethyl ether and cyclohexene oxide were removed by partial vacuum distillation. Distillation under full vacuum yielded a colorless fraction boiling at 95° C., (±)-trans-2-(methylamino)cyclohexanol: 217 g (84%).

Provenance & Evidence