Phosphorus sulfide (P2S5) → HCID 86722618, compound

Participants

Reaction Steps

To a stirred solution of (R)-tert-butyl 1-oxo-1-(2,2,2-trifluoroethylamino)propan-2-ylcarbamate (100 mg, 0.37 mmol) in CH2Cl2 (10 mL) was added P2S5 (24 mg, 0.11 mmol) and hexamethyldisiloxane (HMDO) (0.13 mL, 0.59 mmol) at room temperature and the mixture was refluxed for 3 h. The reaction mixture was cooled to room temperature and another portion of P2S5 (24 mg, 0.11 mmol) was added and the resulting mixture was refluxed for 18 h. The volatiles were evaporated, pentane (25 mL) was added to the residue and stirred for 10-15 min. The pentane layer was decanted, concentrated in vacuo and the residue was passed through a short silica pad eluting with pentane followed by CH2Cl2 to give the title compound as colorless liquid (30 mg, 30%): 1H NMR (400 MHz, DMSO-d6) δ 10.27 (t, J=5.4 Hz, 1H), 7.00 (d, J=6.8 Hz, 1H), 4.57-4.35 (m, 3H), 1.32 (s, 9H), 1.25 (d, J=7.6 Hz, 3H); ESIMS m/z 286.2 ([M+H]+); IR (thin film) 3233, 1683, 1257 cm−1.

Provenance & Evidence