反应详情

To a solution of 4-(methoxy-methyl-carbamoyl)-piperidine-1-carboxylic acid tert-butyl ester (5.0 g, 18.36 mmol) in 50 mL dry THF at ambient temperature was added (4-methoxy-3-methylphenyl)magnesium bromide (55.1 mL, 0.5 M) was added dropwise under N2, the reaction mixture was stirred at the same temperature for 16 hours. The reaction was quenched with saturated sodium sulfate solution (10 mL) and partitioned between brine (150 mL) and 10% isopropyl alcohol/chloroform (200 mL), and the organic layer was removed to yield the crude product. Purification by flash chromatography (silica: 5-35% ethyl acetate/pentane) gave the title compound as a white solid (6.4 g, 19.21 mmol, >99% yield). HPLC (Novapak 150×3.9 mm C-18 column: mobile phase: 10-90% acetonitrile/water with 0.1% TFA, at 2 mL/min over 2 min.) retention time=4.131 min.

1. additionwas added dropwise under N2
2. customThe reaction was quenched with saturated sodium sulfate solution (10 mL)
3. custompartitioned between brine (150 mL) and 10% isopropyl alcohol/chloroform (200 mL)
4. customthe organic layer was removed
5. customto yield the crude product
6. customPurification by flash chromatography (silica: 5-35% ethyl acetate/pentane)