Diethyl Pyrocarbonate → 2-[ethyl-(4-fluorophenyl)sulfonyl-amino]-N-[[2-[4-(trifluoromethyl)phenyl]-4-pyridyl]methyl]prop-2-enamide

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Acid 4B (273.28 mg, 1 mmol) was dissolved in 10 ml of THF and at rt DEPC (1.1 equiv, 0.15 ml) and [2-[4-(trifluoromethyl)phenyl]-4-pyridyl]methanamine 21A (1.1 equiv., 277.5 mg) were added to the solution. The mixture was stirred at rt overnight then evaporated. The residue was dissolved in AcOEt (30 ml) and washed with water (1×20 ml) and brine. The organic phase was dried over sodium sulfate and concentrated under vacuum. The purification of the crude by chromatographic column (EtOAc 1/petroleum ether 1) afforded 100 mg of a white solid. Yield=19% 1HNMR (DMSO, 400 MHz) δ 1.09 (3H, t, J=7.2 Hz), 3.39 (2H, q, J=6.8 Hz), 4.48 (2H, d, J=6 Hz), 5.15 (1H, s), 6.14 (1H, s), 7.36 (1H, dd, J=4.8 Hz, J′=1.2 Hz), 7.47 (2H, t, J=8.8 Hz), 7.84 (4H, m), 8.01 (1H, s), 8.30 (2H, d, J=8 Hz), 8.64 (1H, dd, J=5.2 Hz, J′=0.8 Hz), 8.89 (1H, bt) [M+1] 508.7 (C24H21F4N3O3S requires 507.50).

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