N-bromobutanimide → 3-bromo-5-((2R,4R)-2-methyltetrahydro-2H-pyran-4-yl)pyrazin-2-amine

HRID 595842Notes

Reaction equation

[CH3:1][C@@H:2]1[CH2:7][C@H:6]([C:8]2[N:9]=[CH:10][C:11]([NH2:14])=[N:12][CH:13]=2)[CH2:5][CH2:4][O:3]1.C1C(=O)N([Br:22])C(=O)C1>C(#N)C>[Br:22][C:10]1[C:11]([NH2:14])=[N:12][CH:13]=[C:8]([C@@H:6]2[CH2:5][CH2:4][O:3][C@H:2]([CH3:1])[CH2:7]2)[N:9]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of 5-((2R,4R)-2-methyltetrahydro-2H-pyran-4-yl)pyrazin-2-amine (40 mg, 0.207 mmol) in acetonitrile (3 mL) was added NBS (35.0 mg, 0.197 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 15 min. After quenched with NaHCO3, the reaction mixture was extracted with EtOAc three times. The organic layers were combined and washed with water, and brine. Dried over Na2SO4, filtered and concentrated to afford 47 mg of 3-bromo-5-((2R,4R)-2-methyltetrahydro-2H-pyran-4-yl)pyrazin-2-amine, which was used as it was. LCMS (m/z): 274 (MH+), 0.64 min. For 5-((2S,4S)-2-methyltetrahydro-2H-pyran-4-yl)pyrazin-2-amine, following the above method, 3-bromo-5-((2S,4S)-2-methyltetrahydro-2H-pyran-4-yl)pyrazin-2-amine was obtained. LCMS (m/z): 274 (MH+), 0.65 min. The absolute stereochemistry of the products were assigned arbitrarily.

Workup

customAfter quenched with NaHCO3
extractionthe reaction mixture was extracted with EtOAc three times
washwashed with water, and brine
dry with materialDried over Na2SO4
filtrationfiltered
concentrationconcentrated

Sources & evidence

ORD record: ord-3bbf160b4be446cea31d31e0b36fca71
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09242996B2

Reaction notes

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