反应详情

A stirred solution of (±)-tert-butyl 2-(methoxy(methyl)carbamoyl)morpholine-4-carboxylate (1.73 g, 6.4 mmol) in dry THF (40 mL) was cooled in an ice-salt bath and 1.34 M 4-methoxybutylmagnesium chloride in THF (10 mL, 1.34 mmol) was added dropwise over 3 min. The cooling bath was allowed to expire and the mixture was stirred at rt for 6 h, poured into ice cold 3% aq HCl (100 mL) and extracted with ether (2×100 mL). The combined ether extracts were washed with satd aq NaHCO3 (35 mL), dried over MgSO4 and concentrated to afford (±)-tert-butyl 2-(5-methoxypentanoyl)morpholine-4-carboxylate (1.78 g, 93%) as an oil.

1. extractionextracted with ether (2×100 mL)
2. washThe combined ether extracts were washed with satd aq NaHCO3 (35 mL)
3. dry with materialdried over MgSO4
4. concentrationconcentrated