Trifluoroacetic acid → (2-Amino-1,3-benzothiazol-6-yl) 4-[(2-hydroxy-2-methylpropyl)amino]benzenesulfonate;2,2,2-trifluoroacetic acid

Participants

Reaction Steps

A solution of 4-(2-hydroxy-2-methylpropylamino)benzenesulfonic acid 2-tert-butoxycarbonylaminobenzothiazol-6-yl ester (intermediate 81) (170 mg, 0.344 mmol) and trifluoroacetic acid (14.9 g, 130.7 mmol) in 10 ml of dichloromethane and 100 μl of water is stirred for 2 hours at room temperature. The reaction medium is evaporated to dryness, taken up in ethyl acetate and washed with water, and then with saturated sodium chloride solution. The organic phase is dried over magnesium sulfate and concentrated to dryness to give 130 mg of 4-(2-hydroxy-2-methylpropylamino)benzenesulfonic acid 2-aminobenzothiazol-6-yl ester; compound with trifluoroacetic acid in a yield of 96%.

Provenance & Evidence