反应详情

A solution of cyclopropanecarboxylic acid (6-hydroxybenzothiazol-2-yl)amide (intermediate 6) (1.81 g, 7.72 mmol), 4-fluorobenzenesulfonyl chloride (1.5 g, 7.72 mmol) and triethylamine (2.14 ml, 15.45 mmol) in 43 ml of acetone, in a 100 ml round-bottomed flask equipped with a magnetic bar, is stirred for 1 hour at room temperature. The precipitate obtained is filtered off and the filtrate is evaporated. The residue is washed with acetone and ethyl ether, to give 1.92 g of 4-fluorobenzenesulfonic acid 2-(cyclopropanecarbonylamino)-benzothiazol-6-yl ester (off-white powder) in a yield of 66%.

1. customThe precipitate obtained
2. filtrationis filtered off
3. customthe filtrate is evaporated
4. washThe residue is washed with acetone and ethyl ether