反应详情

Methyl 5-amino-2-methylbenzoate (1.0 eq, 3.75 g) was dissolved in acetic acid (70 ml). N-Iodosuccinimide (1.0 eq, 5.27 g) was added portionwise over 60 minutes. The mixture was stirred at room temperature for 30 minutes. Acetic acid was evaporated. The residue was diluted with ethyl acetate (80 ml) and neutralized with saturated sodium carbonate (80 ml). The organic layer was washed with 1M sodium thiosulfate (2×40 ml), then water (2×40 ml) and brine (2×40 ml). The material was purified by flash chromatography on silica gel (gradient 10% to 30% ethyl acetate in hexanes) to provide methyl 5-amino-4-iodo-2-methylbenzoate as a yellow-orange solid (3.19 g, 49% yield). GCMS>95% pure, m/z 291. 1H NMR (400 MHz, DMSO, d6) δ 2.30 (s, 3H), 3.78 (s, 3H), 5.27 (br s, 2H), 7.24 (s, 1H), 7.54 (s, 1H).

1. customAcetic acid was evaporated
2. additionThe residue was diluted with ethyl acetate (80 ml)
3. washThe organic layer was washed with 1M sodium thiosulfate (2×40 ml)
4. customThe material was purified by flash chromatography on silica gel (gradient 10% to 30% ethyl acetate in hexanes)