tert-Butyl bromoacetate → Dimethyl (2s,3s,5s)-5-(2-tert-butoxy-2-oxoethoxy)-2-[(4-phenylpiperazin-1-yl)carbonyl]piperidine-1,3-dicarboxylate

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To a solution of dimethyl (2S,3S,5S)-5-hydroxy-2-[(4-phenylpiperazin-1-yl)carbonyl]piperidine-1,3-dicarboxylate (50.0 mg, 0.000123 mol) in tetrahydrofuran (0.50 mL, 0.0062 mol) was added 1.00 M of potassium tert-butoxide in tetrahydrofuran (0.150 mL). After stirred at rt for 30 min, to the mixture was added bromo-acetic acid 1,1-dimethylethyl ester (0.0228 mL, 0.000154 mol). The resulting mixture was stirred at rt overnight and then concentrated to dry.

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