反应详情

204 mg of 3-methyl[1,3]thiazolo[3,2-a]benzimidazole were solubilised in acetone (3 mL). Then 558 mg (3 eq) of 4-nitrobenzyl chloride were added and the solution stirred under reflux. After 18 h, 3-methyl-9-(4-nitrobenzyl)[1,3]thiazolo[3,2-a]benzimidazol-9-ium chloride was recovered as a pale yellow powder (363 mg, 94%) by filtration. Mp 241° C.; 1H NMR (300 MHz, MeOD) δ=2.95 (3H, d, J=1.3, CH3), 5.97 (2H, s, CH2), 7.30 (1H, q, J=1.3, H5), 7.68-7.82 (4H, m, Ar), 7.96-8.03 (1H, m, Ar), 8.27-8.36 (3H, m, Ar); 13C NMR (75 MHz, MeOD) δ=14.11, 50.56, 112.76, 113.82, 115.08, 125.37 (2C), 126.63, 128.64, 129.12, 131.04 (2C), 135.43, 137.72, 140.44, 149.92, 156.37; HRMS m/z C17H14N3O2S [M−Cl]− calcd: 324.0801, found: 324.0802.

1. temperatureunder reflux
2. filtration3-methyl-9-(4-nitrobenzyl)[1,3]thiazolo[3,2-a]benzimidazol-9-ium chloride was recovered as a pale yellow powder (363 mg, 94%) by filtration