Trifluoroacetic anhydride → HCID 59275416, compound

Participants

Reaction Steps

Trifluoroacetic anhydride (375 μL, 2.66 mmol) was added to a stirring solution of DIEA (928 μL, 5.31 mmol), 2-(4-fluorophenyl)-5-isopropoxy-6 (methylsulfonamido) benzofuran-3-carboxamide (300 mg, 0.738 mmol) in CH2Cl2 (4 mL) and THF (4 mL) at 0° C. for 1 hour. The mixture was diluted with EtOAc and washed with sat NaHCO3, and sat NaCl. The organic phase was dried over Na2SO4, filtered and concentrated. The crude residue was purified by on silica gel (BIOTAGE®, gradient EtOAc/hexanes, fraction collection at λ=254 nm) to give the title compound (143 mg, 50%). 1H NMR (300 MHz, DMSO-d6) δ ppm 1.28-1.41 (m, 6H) 3.01 (s, 3H) 4.77-4.95 (m, 1H) 7.35 (s, 1H) 7.44-7.57 (m, 2H) 7.68 (s, 1H) 8.04-8.20 (m, 2H) 9.01 (s, 1H). LC-MS retention time: 1.65 min; m/z (MH−): 387. LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Waters XBridge 5u C18 4.6×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 5 ml/min, a gradient of 100% solvent A/0% solvent B to 0% solvent A/100% solvent B, a gradient time of 2 min, a hold time of 1 min, and an analysis time of 3 min where solvent A was 5% acetonitrile/95% H2O/10 mM ammonium acetate and solvent B was 5% H2O/95% acetonitrile/10 mM ammonium acetate. MS data was determined using a MICROMASS® Platform for LC in electrospray mode.

Provenance & Evidence