Reaction Steps
Reaction of oxalyl chloride (100 λL, 1.1 mmol) and benzoic acid 4 (275 mg, 0.7 mmol) with subsequent coupling to N-methyl-N-(3-pyridinyl)amine (88 mg, 0.8 mmol) gave benzamide 7 (237 mg, 69%) as a white powder: mp (MeOH) 195-197° C.; 1H NMR δ 8.37 (d, J=2.4 Hz, 1H, H-2′), 8.35 (dd, J=4.7, 1.5 Hz, 1H, H-6′), 7.72 (ddd, J=8.2, 2.4, 1.5 Hz, 1H, H-4′), 7.67 (br d, J=8.5 Hz, 2H, H-2, H-6), 7.63 (br d, J=8.2 Hz, 2H, H-2″, H-6″), 7.37-7.42 (m, J=8.2 Hz, 4H, H-3, H-5, H-3″, H-5″), 7.34 (ddd, J=8.2, 4.7 Hz, 1H, H-5′), 4.58 (s, 2H, CH2SO2), 3.42 (s, 3H, NCH3), 2.34 (s, 3H, CH3), 2.06 (s, 3H, CH3); 13C NMR δ 168.8, 157.8, 149.8, 148.1, 147.3, 144.4, 140.7, 137.4, 135.5, 134.2, 129.6 (2), 129.0 (2), 128.2 (2), 127.2, 125.9, 125.0 (2), 123.8, 52.9, 37.6, 21.0, 9.6; MS m/z 462.6 (MH+, 100%). Anal. calcd for C25H23N3O4S: C, 65.06; H, 5.02; N, 9.10. Found: C, 64.90; H, 4.92; N, 8.83%.
