2-Iodobenzoic acid → N-(6,7-Methylenedioxyquinolin-4-yl)-N-(N,N-dimethylaminoethyl)-2-iodobenzamide

Participants

Reaction Steps

Oxalyl chloride (1.05 g, 8.1 mmol) was added to a solution of o-iodobenzoic acid (0.57 g, 2.3 mmol) in methylene chloride (20 mL) under nitrogen, and the stirred mixture refluxed for 4 h. The mixture was then concentrated to dryness under vacuum. The acid chloride was redissolved in methylene chloride (20 mL) and added to a solution of compound 7 and triethylamine (2.0 g, 20.0 mmol) in methylene chloride (20 mL). The reaction was stirred at reflux under nitrogen for 2 h. The mixture was then cooled and washed with a saturated solution of sodium bicarbonate (3×75 mL), and extracted into dilute HCl (3×75 mL), and the combined aqueous extracts were washed with chloroform (75 mL), made basic using 30% NaOH, then extracted with chloroform (3×75 mL). The combined organic extracts were washed with brine (100 mL), dried (anhydrous MgSO4), and concentrated in vacuo, to give 795 mg, in 84% yield; IR (CHCl3) 1653; 1H NMR (CDCl3) δ 2.23 (s, 6H), 2.60 (m, 2H), 3.52 (m, 1H), 4.57 (m, 1H), 6.13 (d, 1H, J=0.7), 6.16 (d, 1H, J=0.7), 6.78 (m, 3H), 7.32 (m, 2H), 7.36 (s, 1H), 7.64 (d, 1H, J=7.6), 8.48 (d, 1H, J=4.8); 13C NMR (CDCl3) δ 45.6, 46.8, 56.5, 93.9, 98.4, 102.3, 106.5, 120.2, 122.8, 126.5, 127.2, 128.3, 130.2, 139.5, 141.5, 145.6, 148.2, 149.2, 151.2, 170.0.

Provenance & Evidence