Trifluoroacetic acid → 2,2,4,4-Tetramethyl-chroman-6-carboxylic acid 4-(carboxymethyl)phenyl ester

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Reaction Steps

A solution of 2,2,4,4-tetramethyl-chroman-6-carboxylic acid 4-(tert-butoxycarbonylmethyl)phenyl ester (Compound 45, 0.1 g, 0.23 mmol) was treated with 5 mL of trifluoroacetic acid and stirred at ambient temperature for 1 h. The trifluoroacetic acid was distilled off under reduced pressure and the residue was subjected to preparative reverse phase HPLC using 10% water in acetonitrile as the mobile phase to afford the title compound as a white solid (0.045 g, 50%).

Provenance & Evidence