CID 16711988 → Tert-butyl 5-fluorospiro[indoline-3,3'-piperidine]-1'-carboxylate

HRID 529090Notes

Reaction equation

[F:1][C:2]1[CH:3]=[C:4]2[C:10]3([CH2:15][CH2:14][CH2:13][N:12]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:11]3)[C:9](=O)[NH:8][C:5]2=[CH:6][CH:7]=1.COCCO[Al]OCCOC.[Na]>C1(C)C=CC=CC=1>[F:1][C:2]1[CH:3]=[C:4]2[C:10]3([CH2:15][CH2:14][CH2:13][N:12]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:11]3)[CH2:9][NH:8][C:5]2=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 75 °C

Procedure

To a stirred solution of tert-butyl 5-fluoro-2-oxospiro[indoline-3,3′-piperidine]-1′-carboxylate (0.80 g, 2.5 mmol) in toluene (20 mL) was added dropwise a solution of sodium bis(2-methoxyethoxy)aluminium hybrid (Red-Al) in toluene (65% w/w, 1.1 mL, 3.5 mmol) at about 70° C. under N2. The reaction mixture was stirred at about 75° C. for 3 h. After cooling, the reaction mixture was quenched with EtOAc and concentrated in vacuo. The residue was diluted with EtOAc, washed with water and brine, dried and concentrated. The residue was purified by column chromatography (hexane:EtOAc, 3:1) to give tert-butyl 5-fluorospiro[indoline-3,3′-piperidine]-1′-carboxylate (0.18 g, 24%) as an oil. LCMS (APCI+) m/z 307 [M+H]+; Rt=3.66 min.

Workup

temperatureAfter cooling
customthe reaction mixture was quenched with EtOAc
concentrationconcentrated in vacuo
additionThe residue was diluted with EtOAc
washwashed with water and brine
customdried
concentrationconcentrated
customThe residue was purified by column chromatography (hexane:EtOAc, 3:1)

Sources & evidence

ORD record: ord-f1feb520ab654c31bffa9140c7af3f58
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09346805B2

Reaction notes

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