Trifluoroacetic acid → 5-[4-(2-aminoethyl)phenyl]-2-tert-butylisothiazol-3(2H)-one 1,1-dioxide Trifluoroacetate

Participants

Reaction Steps

2-[4-(2-tert-Butyl-1,1,3-trioxo-2,3-dihydro-1H-1λ6-isothiazol-5-yl)-phenyl]-ethyl-carbamic acid tert-butyl ester (200 mg, 0.490 mmol) was dissolved in methylene chloride (2 mL) and trifluoroacetic acid (2 mL) and the reaction was stirred for 2 h. The reaction was chromatographed on a 21 mm Luna C18 column using a 10–90% acetonitrile in water gradient with 0.05% trifluoroacetic acid at 12.5 mL per minute over a 15 minute period. The major fraction was lyophilized to give a white powder (207 mg, 100%). 1H NMR (500 MHz, CDCl3): δ 7.90 (m, 2H), 7.52 (m, 2H), 3.25 (t, J=6.5 Hz, 2H), 3.06 (t, J=7.4 Hz, 2H), 1.73 (s, 9H); LCMS found for C17H22F3N2O5S (M+H)+: m/z=309.2.

Provenance & Evidence