Trifluoroacetic acid → N-[(4aR,7aR)-7a-Isothiazol-5-yl-4a,5,6,7-tetrahydro-4H-pyrrolo[3,4-d][1,3]thiazin-2-yl]benzamide

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Reaction Steps

To a room temperature solution of tert-butyl (4aR,7aR)-2-benzamido-7a-isothiazol-5-yl-4,4a,5,7-tetrahydropyrrolo[3,4-d][1,3]thiazine-6-carboxylate, isomer 2 (1.26 g, 2.83 mmol) in dichloromethane (25 mL) is added trifluoroacetic acid (4.29 mL, 56.68 mmol) drop wise. The resultant solution is stirred for 18 hours at ambient temperature. The solvent is removed under vacuum. The mixture is diluted with ethyl acetate followed by saturated sodium bicarbonate. The layers are separated and the aqueous phase is re-extracted with ethyl acetate (3×). The combined organic layers are dried over sodium sulfate and the solvent is removed under vacuum to give the title compound (850 mg, 2.46 mmol, 87%). ES/MS (m/e): 345 (M+H).

Provenance & Evidence