(1R,2R)-trans-N-Boc-1,2-cyclohexanediamine → tert-Butyl (1R,2R)-2-(1-(4-(oxazol-2-yl)phenyl)piperidin-3-ylamino)cyclohexylcarbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-(4-(oxazol-2-yl)phenyl)piperidin-3-yl methane sulfonate (110 mg, 0.341 mmol) in acetonitrile (4 mL) was added tert-butyl (1R,2R)-2-aminocyclohexylcarbamate (110 mg, 0.512 mmol). The reaction was stirred in a microwave at 120° C. for 30 min. After this time, LC/MS showed two pairs of products formed. The reaction mixture was concentrated. The residue was diluted with EtOAc and washed with water. The remaining EtOAc organic layer was concentrated. The resulting residue was purified using silica gel chromatography (ISCO system) eluting with a gradient of 50-100% EtOAc/Hex. Under these conditions, the two diastereomers separated and the desired diastereomer tert-butyl (1R,2R)-2-((1-(4-(oxazol-2-yl)phenyl)pyrrolidin-2-yl)methylamino)cyclohexylcarbamate (156 mg total) as a white foam.

Provenance & Evidence