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

HRID 1004936Notes

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 2 N 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-744c6b5dd86148ceae320838bf271465
Source dataset: uspto-grants-2000_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06051712

Reaction notes

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