Ammonium Chloride → 1-Boc-4-methyl-piperidin-4-OL

A solution of N-Boc-piperidin-4-one (1.0 g, 5.0 mmol) was dissolved in THF (20 mL) and then cooled to −40° C. MeMgBr (2.8 M, 7.2 mL, 20 mmol) was added slowly over 10 min. The reaction mixture was allowed to warm to ambient temperature and stirred for 2 h. The mixture was cooled to 0° C. and saturated aqueous NH4Cl (50 mL) was added. The resulting mixture was extracted with EtOAc (100 mL). The organic layer was washed with water (50 mL) and brine (50 mL), dried over anhydrous sodium sulfate, and concentrated to afford tert-butyl 4-hydroxy-4-methylpiperidine-1-carboxylate (1.0 g, 92% yield) as a yellow oil.

1. temperatureto warm to ambient temperature
2. temperatureThe mixture was cooled to 0° C.
3. extractionThe resulting mixture was extracted with EtOAc (100 mL)
4. washThe organic layer was washed with water (50 mL) and brine (50 mL)
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated

ORD record

ord-332a591d16b646858971d1b293a88d68

Source dataset

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09434761B2