反应详情

HATU (209 mg, 0.550 mmol) was added to a stirring solution of methanamine (1.2 mL, 2.4 mmol, 2M in THF), DIEA (240 μL, 1.37 mmol) and 5-(5-(tert-butoxycarbonyl)-2-methylphenyl)-2-(4-fluorophenyl)furo[2,3-b]pyridine-3-carboxylic acid (205 mg, 0.458 mmol) in DMF (4.5 mL) at rt. It was allowed to stir for 1 hour. The mixture was diluted with EtOAc and washed with sat NaCl. The organic phase was dried over Na2SO4, filtered and concentrated and was purified on silica gel (Biotage, EtOAc/hexanes gradient, fraction collection at λ=254 nm) to give the expected product tert-butyl 3-(2-(4-fluorophenyl)-3-(methylcarbamoyl)furo[2,3-b]pyridin-5-yl)-4-methylbenzoate (190 mg, 0.413 mmol, 90% yield) consistent by LCMS and NMR. 1H NMR (400 MHz, MeOD) d ppm 8.28 (1H, d, J=2.26 Hz), 8.08 (1H, d, J=2.01 Hz), 7.99-8.06 (2H, m), 7.92 (1H, dd, J=8.03, 1.76 Hz), 7.86 (1H, d, J=1.51 Hz), 7.45 (1H, d, J=8.03 Hz), 7.30 (2H, t, J=8.78 Hz), 2.95 (3H, s), 2.34 (3H, s), 1.60 (9H, s). LC-MS retention time: 2.70 min; m/z (MH+): 461. LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Waters SunFire 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 3 min, a hold time of 1 min, and an analysis time of 4 min where solvent A was 10% acetonitrile/90% H2O/0.1% trifluoroacetic acid and solvent B was 10% H2O/90% acetonitrile/0.1% trifluoroacetic acid. MS data was determined using a Micromass Platform for LC in electrospray mode.

1. washwashed
2. dry with materialThe organic phase was dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated
5. customwas purified on silica gel (Biotage, EtOAc/hexanes gradient, fraction collection at λ=254 nm)