1-Bromo-3-fluorobenzene → (R)-tert-butyl 3-(3-fluorobenzoyl)piperidine-1-carboxylate

HRID 451676Notes

Reaction equation

Br[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([F:8])[CH:3]=1.CON(C)[C:12]([C@@H:14]1[CH2:19][CH2:18][CH2:17][N:16]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:15]1)=[O:13]>C1COCC1>[F:8][C:4]1[CH:3]=[C:2]([CH:7]=[CH:6][CH:5]=1)[C:12]([C@@H:14]1[CH2:19][CH2:18][CH2:17][N:16]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:15]1)=[O:13]

Participants

Conditions

Temperature: 55 °C

Procedure

A solution of 1-bromo-3-fluoro-benzene (57.7 g, 0.33 mol) in anhydrous THF (480 mL) was added dropwise to Mg (10.6 g, 0.44 mol) at rt under nitrogen. The mixture was stirred at 50-60° C. for 1 hr. The resulting Grignard reagent was used for the next step. The Grignard reagent was added dropwise to a solution of (R)-tert-butyl 3-(methoxy(methyl)carbamoyl)piperidine-1-carboxylate (60 g, 0.22 mol) in anhydrous THF (600 mL) at −78° C. under nitrogen. After addition, the mixture was allowed to stir at rt for 1.5 hr. The mixture was quenched with saturated NH4Cl solution (300 mL) and extracted with ethyl acetate (3×200 mL). The combined organic layers were washed with brine, dried over Na2SO4 and concentrated in vacuo to give crude (R)-tert-butyl 3-(3-fluorobenzoyl)piperidine-1-carboxylate (67.5 g, 100%), which was used immediately in the next step without purification.

Workup

additionAfter addition
stirringto stir at rt for 1.5 hr
customThe mixture was quenched with saturated NH4Cl solution (300 mL)
extractionextracted with ethyl acetate (3×200 mL)
washThe combined organic layers were washed with brine
dry with materialdried over Na2SO4
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-ec746a5e71194df1ab8c769c3a61a8ef
Source dataset: uspto-grants-2013_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08487108B2

Reaction notes

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