Methyl iodide → Methyl N-(tert-butoxycarbonyl)-L-threoninate

Participants

Reaction Steps

(2S,3R)-2-tert-Butoxycarbonylamino-3-hydroxy-butyric acid (2 g, 9.12 mmol) was dissolved in N,N-dimethylformamide (15 mL), under an atmosphere of nitrogen. Potassium carbonate (2.02 g, 14.6 mmol) was added and the reaction was cooled using an ice bath. Iodomethane (679 μL, 10.9 mmol) was added and the reaction was stirred for 2 h, and allowed to slowly warm to room temperature. The reaction mixture was diluted with water and extracted with diethyl ether. The organic phase was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated to afford the title compound (1.85 g, 87%) as a colourless oil. 1H NMR (300 MHz, CDCl3) δ 1.26 (d, J=6.6 Hz, 3H), 1.47 (s, 9H), 2.24-2.45 (m, 1H), 3.78 (s, 3H), 4.15-4.37 (m, 2H), 5.21-5.45 (m, 1H). LCMS (m/z) 234.0 [M+H], Tr=1.57 min.

Provenance & Evidence