N-甲基-L-丝氨酸

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of FmocCl (1.35 g, 5.21 mmol) in tetrahydrofuran (5 mL) was added to a solution of N-methyl-L-serine (Compound SP822) (621 mg, 5.21 mmol) and sodium carbonate (580 mg, 5.47 mmol) in tetrahydrofuran (15 mL)-water (20 mL) at room temperature under a nitrogen atmosphere. The reaction mixture was stirred at the same temperature for 20 minutes, followed by addition of diethyl ether (10 mL) and hexane (5 mL). The resulting mixture was extracted with water, and the aqueous layer was washed with ether (15 mL), followed by addition of concentrated hydrochloric acid (1 mL). The resulting mixture was extracted with ethyl acetate three times, and the organic layer was dried over sodium sulfate and then concentrated under reduced pressure. The resulting crude product was purified by reverse-phase silica gel column chromatography (0.05% aqueous trifluoroacetic acid solution/0.05% trifluoroacetic acid-acetonitrile solution) to afford (Compound SP823) (1.49 g, 84%). The resulting mixture was extracted with water the aqueous layer was washed with ether (15 mL) followed by addition of concentrated hydrochloric acid (1 mL) The resulting mixture was extracted with ethyl acetate three times the organic layer was dried over sodium sulfate concentrated under reduced pressure The resulting crude product was purified by reverse-phase silica gel column chromatography (0.05% aqueous trifluoroacetic acid solution/0.05% trifluoroacetic acid-acetonitrile solution) to afford (Compound SP823) (1.49 g, 84%)