Diisopropylethylamine → 1,1-Dimethylethyl N-((7-bromo-4-hydroxy-1,1-dimethyl-2-oxo-naphthalen-3-yl)carbonyl)-L-alaninate

참여 물질

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DIPEA (120 μL, 690 μmol, 1.5 eq) was added to a mixture of ethyl 7-bromo-4-hydroxy-1,1-dimethyl-2-oxo-naphthalen-3-carboxylate (156 mg, 460 μmol, prepared in Example 53A-D) and (S)-tert-butyl 2-aminopropanoate hydrochloride (100 mg, 552 μmol) in dioxane (5 mL). The reaction mixture was stirred at 75° C. for 16 hours. The reaction mixture was cooled to room temperature and partitioned between EtOAc and water. The organic layer was separated, washed with brine, dried (MgSO4), and concentrated in vacuo to give a yellow oil. The crude oil was purified by silica flash chromatography (0-50% DCM/hexane) to give the desired ester as a transparent oil (137 mg). MS (m/e)=382.1 (M+H-tBu)+.

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