Allyl bromide → Ethyl 1-[(phenylmethoxy)carbonyl]-α-2-propen-1-yl-4-piperidineacetate

To a −78 □C solution of benzyl 4-(2-ethoxy-2-oxoethyl)piperidine-1-carboxylate (5.02 g, 16.4 mmol) in THF (90 mL) was added lithium hexamethyldisilazide (1.0 M in THF, 18.1 mL, 18.1 mmol). After 1 h allyl bromide (2.19 g, 18.1 mmol) was added, the reaction stirred at this temperature for 0.5 h, then warmed to 25 □C. After 3 h the reaction was quenched by the addition of saturated aqueous ammonium chloride and extracted with ethyl acetate (2×). The combined organic layers were dried over MgSO4, filtered, and concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with a gradient of 0 to 60% EtOAc:hexanes to give the title compound (4.08 g). MS: m/z=346.1 (M+1).

1. temperaturewarmed to 25 □C
2. customAfter 3 h the reaction was quenched by the addition of saturated aqueous ammonium chloride
3. extractionextracted with ethyl acetate (2×)
4. dry with materialThe combined organic layers were dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe crude product was purified by silica gel chromatography
8. washeluting with a gradient of 0 to 60% EtOAc

ORD record

ord-ec2554ec4f1e41949c846a9d55c50a10

Source dataset

uspto-grants-2009_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07491713B2