Trifluoroacetic acid → (S)-3-amino-2,3-dihydrobenzo[b][1,4]oxazepin-4(5H)-one trifluoroacetate

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Reaction Steps

To a solution of (S)-tert-butyl 4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]oxazepin-3-ylcarbamate (2 g, 7.19 mmol, Eq: 1.00) in DCM (16.7 mL) at 0° C. was added trifluoroacetic acid (TFA, 16.4 g, 10.7 mL, 144 mmol, Eq: 20.00). After 1 h the mixture was concentrated, and the residue was triturated with 5 mL of Et2O and 35 ml of pentane to give a gum. The solution was removed and this gummy residue material was dried to give the title compound (2.1 g) as a pink foam which was used without purification.

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