Trifluoroacetic anhydride → HCID 68864572, compound

Participants

Reaction Conditions

Reaction Steps

A solution of Example 510E (3.74 g, 9.13 mmol) in dichloroethane (183 mL) was treated with trifluoroacetic anhydride (2.58 mL, 18.3 mmol) and gallium (III) triflate (0.944 g, 1.83 mmol), stirred at 90° C. for 1.5 hours, and cooled to room temperature. The reaction was quenched with saturated aqueous sodium bicarbonate (200 mL), and the aqueous layer was extracted with CH2Cl2 (4×50 mL). The combined organic layers were dried (MgSO4), filtered, and concentrated. The concentrate was purified by flash chromatography (7:3 hexanes/ethyl acetate) to provide the desired product (2.73 g, 76%). MS (ESI(+)) m/e 392 (M+H)+, 409 (M+NH4)+, 414 (M+Na)+; MS (ESI(−)) m/e 390 (M−H)−; 1H NMR (300 MHz, DMSO-d6) δ 10.46 (br s, 1H), 7.74 (m, 2H), 7.52 (d, 1H), 7.43 (dd, 1H), 7.35 (td, 1H), 7.25 (d, 1H), 3.70 (s, 3H), 2.67 (t, 2H), 2.61 (m, 2H), 1.72 (m, 2H), 1.60 (m, 2H).

Provenance & Evidence