Triethylamine → Ethyl 1-(bromoacetyl)piperidine-4-carboxylate

A solution of ethyl isonipecotate (5.1 ml, 33 mMoles) in triethylamine (4.7 ml, 33 mMoles) was added dropwise to a stirred ice-cooled solution of bromoacetyl bromide (2.9 ml, 33 mMoles) in ether (75 ml) and stirring was continued for 1 hour. The resulting suspension was washed sequentially with water (2×20 ml), dilute sodium bicarbonate solution (20 ml), dilute citric acid solution (20 ml), water (20 ml) and saturated brine (30 ml), and then the organic fraction was dried (MgSO4) and concentrated under reduced pressure to give ethyl 1-(bromoacetyl)-piperidin-4-carboxylate (4.6 g) as a yellow oil which was used without further purification; NMR (CDCl3): 1.2 (t,3H), 1.6-2.1 (m,4H), 2.5 (m,1H), 2.9 (m,1H), 3.2 (m,1H), 3.8 (s, 2H+m,1H), 4.15 (q,2H), 4.3 (m,1H); m/e 278/280 (M+H)+.

1. washThe resulting suspension was washed sequentially with water (2×20 ml), dilute sodium bicarbonate solution (20 ml), dilute citric acid solution (20 ml), water (20 ml) and saturated brine (30 ml)
2. dry with materialthe organic fraction was dried (MgSO4)
3. concentrationconcentrated under reduced pressure

ORD record

ord-8be58a30db6d4610b41f1f0c7098d675

Source dataset

uspto-grants-1998_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05753659