Tetrahydrofuran → HCID 59382889, compound

Participants

Reaction Conditions

Reaction Steps

(1R,6S)-3-benzyl 7-tert-butyl 3,7-diazabicyclo[4.1.0]heptane-3,7-dicarboxylate (220 mg, 0.663 mmol), CuI (25 mg, 0.2 equiv), and a stirring bar were put in a 100-mL flask. The flask was evacuated and backfilled with N2 gas (3×). Dry THF (5 mL) was added and the mixture was cooled to −40° C. 1 M Cyclohexylmagnesium bromide in THF (2.0 mL, 3 equiv) was added slowly. After 8 min, the reaction mixture was allowed warmed slowly to rt. After 20 min, the reaction mixture turned into black. After stirring a further 2 h, LC-MS showed the reaction was complete. Satd aq NH4Cl solution (5 mL) was added to quench the reaction. The reaction mixture was partitioned between EtOAc (50 mL) and satd aq NH4Cl solution (20 mL). The aqueous layer was extracted with EtOAc (20 mL). The combined EtOAc layers were washed with water (15 mL) and brine (15 mL), and dried over Na2SO4. After concentration, the residue was purified by preparative HPLC to afford (3S,4S)-benzyl 3-(tert-butoxycarbonylamino)-4-cyclohexylpiperidine-1-carboxylate (62.3 mg, 23% yield) and (3S,4S)-benzyl 4-(tert-butoxycarbonylamino)-3-cyclohexylpiperidine-1-carboxylate (15 mg). LC-MS (3 min) tR=2.33 min., m/z 439 (M+Na).

Provenance & Evidence