Reaction Steps
Reaction of oxalyl chloride (61 λL, 0.70 mmol) and benzoic acid 29 (204 mg, 0.47 mmol) with subsequent couping to 3-pyridinylmethylamine (53 λL, 0.52 mmol) gave benzamide 30 (123 mg, 50%) as a white powder: mp (EtOAc) 224-227° C.; 1H NMR δ 9.20 (t, J=5.9 Hz, 1H, CONH), 8.57 (d, J=1.7 Hz, 1H, H-2′), 8.47 (dd, J=4.7, 1.6 Hz, 1H, H-6′), 8.00 (d, J=8.6 Hz, 2H, H-2, H-6), 7.88 (d, J=8.6 Hz, 2H, H-3, H-5), 7.85 (ddd, J=8.6, 2.3, 1.9 Hz, 2H, H-2″, H-6″), 7.70-7.76 (m, 3H, H-4′, H-3″, H-5″), 7.36 (ddd, J=7.8, 4.7, 0.6 Hz, 1H, H-5′), 4.73 (s, 2H, CH2SO2), 4.51 (d, J=5.9 Hz, 2H, CH2N), 2.22 (s, 3H, CH3); 13C NMR δ 165.5, 158.1, 150.0, 148.9, 148.1, 137.8, 135.5, 135.2, 134.9, 132.3 (2), 130.4 (2), 128.8, 128.2, 128.1 (2), 125.7, 125.4 (2), 123.5, 52.8, 40.5, 9.7; MS m/z 526.1 (MH+, 100%), 528.1 (MH+, 100%). Anal. calcd for C24H20BrN3O4S.½H2O: C, 52.95; H, 4.07; N, 7.72. Found: C, 52.74; H, 3.67; N, 7.60%.
