Carbonate Ion → (S)-1,1,1-Trifluoro-3-(7-nitro-1,2,4,5-tetrahydro-benzo[d]azepin-3-yl)-propan-2-ol

Participants

Reaction Conditions

Reaction Steps

7-Nitro-2,3,4,5-tetrahydro-1H-benzo[d]azepine nitric acid salt (2.01 g, 7.88 mmol, 1.0 eq), was placed in THF (100 mL) and MP-carbonate (7.1 g) was added. The reaction was stirred in a sealable vessel for 1 hour and then (S)-2-trifluoromethyl-oxirane (1.30 g, 11.59 mmol, 1.00 mL, 1.47 eq) was added. The reaction vessel was sealed, stirred at room temperature for 1 hour, and then heated at 50° C. overnight. The reaction was then cooled to room temperature and filtered. The resin was washed with CH2Cl2 (150 mL) and the filtrate was concentrated under reduced pressure. Purification by silica gel chromatography using a gradient of 0-50% EtOAc/hex as the eluting solvent to obtain (S)-1,1,1-trifluoro-3-(7-nitro-1,2,4,5-tetrahydro-benzo[d]azepin-3-yl)-propan-2-ol as an orange solid (2.27 g, 95%). m.p.=82-85° C.; LCMS (m/e) 305 (M+1); 1H-NMR (CDCl3, 400 MHz) δ 8.06-7.99 (m, 2H), 7.31-7.26 (m, 1H), 4.16-4.02 (m, 2H), 3.15-2.97 (m, 4H), 2.96-2.81 (m, 3H), 2.81-2.67 (m, 3H).

Provenance & Evidence