Lithium Hydroxide → (3R)-3-{[(tert-butoxy)carbonyl]amino}-2,3-dihydro-1H-indene-5-carboxylic acid

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Reaction Steps

LiOH (647 mg, 15.42 mmol, 3 eq), dissolved in water (8 ml), was added dropwise to an ice-cooled (0° C.) solution of (R)-methyl 3-(tert-butoxycarbonylamino)-2,3-dihydro-1H-indene-5-carboxylate (stage (ii) product of A-07) (1.5 g, 5.15 mmol, 1 eq) in MeOH:THF (1:1, 16 ml), and stirring was carried out for 6 h at RT. After monitoring by thin-layer chromatography, the reaction solution was concentrated and the residue was taken up in water (20 ml) and adjusted to pH 3 with NaHSO3. The acidic, aqueous phase was extracted with ethyl acetate (2×150 ml), washed with sat. NaCl solution (2×50 ml), dried over sodium sulfate and concentrated under reduced pressure. Yield: 70% (1.0 g, 3.61 mmol).

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