Hexane → (R)-tert-butyl 3-(5-fluoro-2-methylbenzoyl)piperidine-1-carboxylate

HRID 218378Notes

Reaction equation

Br[C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[CH3:9].[Li]CCCC.CCCCCC.CON(C)[C:24]([C@@H:26]1[CH2:31][CH2:30][CH2:29][N:28]([C:32]([O:34][C:35]([CH3:38])([CH3:37])[CH3:36])=[O:33])[CH2:27]1)=[O:25]>C1COCC1>[F:8][C:6]1[CH:5]=[CH:4][C:3]([CH3:9])=[C:2]([CH:7]=1)[C:24]([C@@H:26]1[CH2:31][CH2:30][CH2:29][N:28]([C:32]([O:34][C:35]([CH3:38])([CH3:37])[CH3:36])=[O:33])[CH2:27]1)=[O:25]

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 2-bromo-4-fluoro-1-methylbenzene (10.6 g, 0.056 mol) in anhydrous THF (150 mL) at −78° C. under nitrogen was added dropwise a solution of 2.5 M n-BuLi in hexane (22 mL, 0.056 mol). After stirring for 1 hr at −78° C., a solution of (R)-tert-butyl 3-(methoxy(methyl)carbamoyl)piperidine-1-carboxylate (10 g, 0.037 mol) in anhydrous THF (120 mL) was added dropwise. After addition, the reaction mixture was allowed to warn to rt and stirred for 2 hr. The mixture was quenched with saturated NH4Cl (100 mL) solution and extracted with EtOAc (3×80 mL). The combined organic layers were washed with brine, dried over Na2SO4 and concentrated in vacuo to provide crude (R)-tert-butyl 3-(5-fluoro-2-methylbenzoyl)piperidine-1-carboxylate (10.5 g, yield 88%), which was used in the next step without purification.

Workup

additionAfter addition
customto warn to rt
stirringstirred for 2 hr
customThe mixture was quenched with saturated NH4Cl (100 mL) solution
extractionextracted with EtOAc (3×80 mL)
washThe combined organic layers were washed with brine
dry with materialdried over Na2SO4
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-512be86899d54f249e93546eb5ac0cd3
Source dataset: uspto-grants-2012_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08198453B2

Reaction notes

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