反应详情

A mixture of 2-amino-4-trifluoromethyl-benzoic acid methyl ester (51.5 g, 235 mmol), iodine (55.1 g, 217 mmol) and silver sulfate (73.3 g, 234 mmol) in EtOH (1560 mL) was stirred for 1 h at r.t. under nitrogen. The suspension was then filtered and the filtrate diluted with EtOAc and washed once with a 10% aqueous sodium thiosulfate solution. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give 2-amino-5-iodo-4-trifluoromethyl-benzoic acid methyl ester (67.5 g, 196 mmol, 83%) as a brown solid, m.p. 101-103° C., ESI-MS: m/z 346 [M+H]+.

1. filtrationThe suspension was then filtered
2. additionthe filtrate diluted with EtOAc
3. washwashed once with a 10% aqueous sodium thiosulfate solution
4. dry with materialThe organic layer was dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo