2,2,6,6-Tetramethylpiperidine → HCID 23509910, compound

To a solution of n-butyl lithium (95 ml, 15% solution in hexane, 147 mmol) and 2,2,6,6-tetramethylpiperidine (24.9 ml, 147 mmol) in tetrahydrofurane (220 ml) was added a solution of (3-bromo-phenyl)-acetic acid (15.05 g, 70 mmol) in tetrahydrofuran (80 ml) at −78° C. The reaction mixture was stirred for 60 minutes at that temperature. Then 4-bromomethyl-benzonitrile (13.72 g, 70 mmol) in tetrahydrofuran (160 ml) was added. The reaction mixture was stirred for 2 hours at −78° C., then warmed up to room temperature and quenched with ammonium chloride solution (240 ml), 3 N hydrochloric acid (50 ml), and ethyl acetate (300 ml). The organic layer was washed with ammonium chloride solution and brine, dried, and evaporated in vacuo. The residue was solved in ethyl acetate and stirred with methyl-tert-butylether. The precipitate was sucked off and dried in vacuo to give 19.0 g of the desired product (82% yield).

1. stirringThe reaction mixture was stirred for 2 hours at −78° C.
2. customquenched with ammonium chloride solution (240 ml), 3 N hydrochloric acid (50 ml), and ethyl acetate (300 ml)
3. washThe organic layer was washed with ammonium chloride solution and brine
4. customdried
5. customevaporated in vacuo
6. stirringstirred with methyl-tert-butylether
7. customdried in vacuo

ORD record

ord-57e3ec16100e44d4a6ee98efd3882311

Source dataset

uspto-grants-2004_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06759420B1