Hydrochloric Acid → (3RS,4RS)-4-(4-fluorophenyl)-3-(4-methoxy-benzyloxy)-piperidine

HRID 1858557Notes

Reaction equation

[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]2[CH2:13][CH2:12][N:11](C(OC(C)(C)C)=O)[CH2:10][CH:9]2[O:21][CH2:22][C:23]2[CH:28]=[CH:27][C:26]([O:29][CH3:30])=[CH:25][CH:24]=2)=[CH:4][CH:3]=1.Cl>CO>[F:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]2[CH2:13][CH2:12][NH:11][CH2:10][CH:9]2[O:21][CH2:22][C:23]2[CH:24]=[CH:25][C:26]([O:29][CH3:30])=[CH:27][CH:28]=2)=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 50 °C

Procedure

130 mg (0.31 mmol) of tert-butyl (3RS,4RS)-4-(4-fluorophenyl)-3-(4-methoxy-benzyloxy)-piperidine-1-carboxylate were dissolved in 5 ml of methanol, treated with 5 ml of a 2N solution of hydrogen chloride in methanol and stirred at 50° C. for 4 hours. Subsequently, the mixture was partitioned between ethyl acetate and aqueous 5% sodium hydrogen carbonate solution, the organic phase was dried over magnesium sulphate and finally the solvent was distilled off under reduced pressure. For purification, the crude product was chromatographed on silica gel with a 10:1:0.1 mixture of methylene chloride, methanol and ammonia as the eluent. There were obtained 76 mg (78% of theory) of (3RS,4RS)-4-(4-fluorophenyl)-3-(4-methoxy-benzyloxy)-piperidine as a colourless oil. MS: 316 (M+H)+.

Workup

customSubsequently, the mixture was partitioned between ethyl acetate and aqueous 5% sodium hydrogen carbonate solution
dry with materialthe organic phase was dried over magnesium sulphate
distillationfinally the solvent was distilled off under reduced pressure
customFor purification
customthe crude product was chromatographed on silica gel with a 10:1:0.1 mixture of methylene chloride, methanol and ammonia as the eluent

Sources & evidence

ORD record: ord-0858b78ecf3d4dea99a98139f55e0c0a
Source dataset: uspto-grants-2000_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06150526

Reaction notes

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