Hydrochloric Acid → trans-2-(1H-pyrrol-1-yl)cyclohexanamine hydrogen chloride

Participants

Reaction Conditions

Reaction Steps

tert-Butyl N-[(1R,2R)-2-aminocyclohexyl]carbamate (1.06 g, 4.93 mmol), sodium acetate (1.70 g, 20.7 mmol) and 2,5-dimethoxytetrahydrofuran (764 μL, 5.91 mmol) were combined in acetic acid (10.6 mL). The reaction mixture was heated at 80° C. for 16 hours. The reaction mixture was then evaporated to dryness and the residue was partitioned between ethyl acetate and a saturated aqueous solution of sodium bicarbonate. The layers were separated, and the organic layer was washed twice with a saturated aqueous solution of sodium chloride, dried over sodium sulfate, and evaporated to dryness to yield a brown solid. This solid was then dissolved in HCl in dioxane (10.3 mL of 4.0 M, 41.1 mmol) and was allowed to stand for 3 hours. The solvent was then removed to yield trans-2-(1H-pyrrol-1-yl)cyclohexanamine hydrogen chloride (989 mg, 99%) as a brown solid. ESI-MS m/z calc. 164.1, found 165.2 (M+1)+; Retention time: 0.27 minutes (4 min run).

Provenance & Evidence