N-bromobutanimide → (S)-1-(5-Bromo-6-methoxypyridin-2-yl)pyrrolidin-3-ol

HRID 338554Notes

Reaction equation

[CH3:1][O:2][C:3]1[N:8]=[C:7]([N:9]2[CH2:13][CH2:12][C@H:11]([OH:14])[CH2:10]2)[CH:6]=[CH:5][CH:4]=1.[Br:15]N1C(=O)CCC1=O>C(Cl)(Cl)Cl>[Br:15][C:4]1[CH:5]=[CH:6][C:7]([N:9]2[CH2:13][CH2:12][C@H:11]([OH:14])[CH2:10]2)=[N:8][C:3]=1[O:2][CH3:1]

Participants

Conditions

Temperature: 8 °C

Procedure

To a solution of (3S)-1-(6-methoxypyridin-2-yl)pyrrolidin-3-ol (1.6 g, 8.24 mmol) in chloroform (90 mL), was added N-bromosuccinimide (1.47 g, 8.24 mmol) at 0° C. with an ice bath. The reaction was allowed to stir at room temperature (8° C.) for 5 hour. TLC (petroleum ether/ethyl acetate) showed that the reaction was complete. The reaction mixture was evaporated to remove chloroform, dissolved in DCM (20 mL) and diluted with water (15 mL). The resulting mixture was separated and the aqueous phase was extracted with dichloromethane (25 mL*3). The combined organic phase was washed with brine, dried over sodium sulfate and evaporated in vacuo. The residue was purified by silica gel chromatography with ethyl acetate/petroleum ether, 0-25% to give the title compound (187 mg, 8.5%) as a yellow gum. 1H NMR (400 MHz, CDCl3) ppm 7.46 (d, 1H) 5.77 (d, 1H) 4.44-4.59 (m, 1H) 3.92 (s, 3H) 3.37-3.61 (m, 4H) 1.96-2.24 (m, 3H).

Workup

customThe reaction mixture was evaporated
customto remove chloroform
dissolutiondissolved in DCM (20 mL)
additiondiluted with water (15 mL)
customThe resulting mixture was separated
extractionthe aqueous phase was extracted with dichloromethane (25 mL*3)
washThe combined organic phase was washed with brine
dry with materialdried over sodium sulfate
customevaporated in vacuo
customThe residue was purified by silica gel chromatography with ethyl acetate/petroleum ether, 0-25%

Sources & evidence

ORD record: ord-13315cbc8a384caa80636814d23b0c61
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08889730B2

Reaction notes

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