Lithium hydroxide, monohydrate → 4-(4-((S)-1-((S)-6-(2-hydroxy-2-methylpropyl)-2-oxo-6-phenyl-1,3-oxazinan-3-yl)ethyl)phenyl)-2,2-dimethylbut-3-ynoic acid

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Reaction Steps

To a stirred solution of butyl 4-(4-((S)-1-((S)-6-(2-hydroxy-2-methylpropyl)-2-oxo-6-phenyl-1,3-oxazinan-3-yl)ethyl)phenyl)-2,2-dimethylbut-3-ynoate (11.3 mg, 0.022 mmol) in 1:1:2 THF/H2O/MeOH (2 mL) was added LiOH.H2O (60 mg, 1.4 mmol). The mixture was stirred at rt for 1 day and concentrated. The residue was purified by prep HPLC to afford 4-(4-((S)-1-((S)-6-(2-hydroxy-2-methylpropyl)-2-oxo-6-phenyl-1,3-oxazinan-3-yl)ethyl)phenyl)-2,2-dimethylbut-3-ynoic acid (7 mg, 72%) as a solid. LC-MS Method 1 tR=1.58 min, m/z=464, 406; 1H NMR (CDCl3) 1.12 (s, 3H), 1.18 (s, 3H), 1.51 (d, 3H), 1.58 (s, 6H), 2.10-2.40 (5H), 2.90 (m, 1H), 5.67 (q, 1H), 6.86 (d, 2H), 7.18 (d, 2H), 7.30-7.40 (5H).

Provenance & Evidence