4-Chlorobenzylamine → N-(4-Chlorobenzyl)-9-iodo-3-methyl-7-oxo-2,3-dihydro-7H-[1,3,4]oxadiazino[6,5,4-ij]quinoline-6-carboxamide

Participants

Reaction Steps

A solution of 9-iodo-3-methyl-7-oxo-2,3-dihydro-7H-[1,3,4]oxadiazino[6,5,4-ij]quinoline-6-carboxylic acid (Preparation 31, 0.900 g) in tetrahydrofuran (25 mL) is refluxed with 1,1′-carbonyldiimidazole (0.631 g) for 5 h. The reaction mixture is cooled to room temperature and treated with 4-chlorobenzylamine (0.828 g). The reaction mixture is diluted with ether (75 mL), filtered, and the filtrate is concentrated at reduced pressure. The crude product is purified by chromatography, using 75 g of silica gel packed and eluted with EtOAc/CH2Cl2/heptane (1/4/5), to afford a 57% yield of the title compound. Physical characteristics: 1H NMR (DMSO-d6) δ10.15, 8.67, 8.12, 7.75, 7.37, 5.29, 4.54, 2.98; MS (EI) m/z 495 (M+); HRMS (FAB) m/z 495.9935 (C19H15ClIN3O3+H). Anal. Found: C, 45.97; H, 3.14; N, 8.39.

Provenance & Evidence