Trifluoroacetic acid → 2-[(2R)-Pyrrolidin-2-yl]-1,3-benzoxazole trifluoroacetate

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Reaction Steps

In a 16 mL flask, trifluoroacetic acid (4 mL) was added to a mixture of tert-butyl(2R)-2-(1,3-benzoxazol-2-yl)pyrrolidine-1-carboxylate (88 mg, 0.31 mmol; which may be prepared as described in Step 2) dissolved in dichloromethane (4 mL) at 0° C. under nitrogen. The reaction was allowed to warm to room temperature and stirred for 3 h. The reaction mixture was concentrated to dryness and the residue used in the next step without further purification.

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