反应详情

The procedure of Example 4, step (c) was followed using 304 mg (1.00 mmol) 1-methyl-4-(4-nitro-3-piperidin-1-yl-phenyl)-piperazine (as prepared in the previous step) and 304 mg of 10% palladium on carbon (50% by weight water) to prepare the intermediate aniline (4-(4-methyl-piperazin-1-yl)-2-piperidin-1-yl-phenylamine) along with 140 mg (1.02 mmol) of 5-cyanofuran-2-carboxylic acid (as prepared in Example 1), 178 μL (2.04 mmol) of oxalyl chloride, 10 μL of anh DMF, and 267 μL (1.53 mmol) of DIEA to perform the amide coupling. The resulting residue was chromatographed on a 20-g silica SPE column with 2-5% EtOH-dichloromethane to afford, after slow concentration from EtOAc-hexane (1:1), 232 mg (59%) of the title compound as a yellow solid: 1H-NMR (CDCl3; 400 MHz): δ 9.53 (br s, 1H), 8.32 (d, 1H, J=8.9 Hz), 7.25 (d, 1H, J=3.7 Hz, partially obscured by CHCl3 peak), 7.21 (d, 1H, J=3.7 Hz), 6.80 (d, 1H, J=2.7 Hz), 6.73 (dd, 1H, J=8.9, 2.7 Hz), 3.20 (m, 4H), 2.85 (m, 4H), 2.59 (m, 4H), 2.36 (s, 3H), 1.80 (m, 4H), and 1.65 (br m, 2H). Mass spectrum (ESI, m/z): Calcd. for C22H27N5O2, 394.2 (M+H), found 394.2.

1. customThe resulting residue was chromatographed on a 20-g silica SPE column with 2-5% EtOH-dichloromethane
2. customto afford
3. concentrationafter slow concentration from EtOAc-hexane (1:1), 232 mg (59%) of the title compound as a yellow solid