Pyridine → N-(5-bromopyridin-3-yl)-2-methylpropanamide

HRID 1497830Notes

Reaction equation

[NH2:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([Br:8])[CH:7]=1.N1C=CC=CC=1.[C:15](Cl)(=[O:19])[CH:16]([CH3:18])[CH3:17]>C(Cl)Cl>[Br:8][C:6]1[CH:7]=[C:2]([NH:1][C:15](=[O:19])[CH:16]([CH3:18])[CH3:17])[CH:3]=[N:4][CH:5]=1

Participants

Conditions

Temperature: 0 °C

Procedure

3-Amino-5-bromo pyridine (XXII) (1 eq) was dissolved in DCM and cooled to 0° C. before adding pyridine (2.2 eq) and isobutyryl chloride (XXIII) (1.1 eq). The reaction mixture was stirred at room temperature for 15 h until TLC showed the reaction was complete. The reaction mixture was diluted with DCM and washed with water. The organic extract was dried, concentrated and purified by column chromatography using silica gel (100-200 mesh) to afford N-(5-bromopyridin-3-yl)isobutyramide (XXIV) as an off-white solid, (71% yield). 1H NMR (CDCl3) δ ppm 8.55-8.35 (m, 3H), 7.32 (s, 1H), 2.59-2.48 (m, 1H), 1.28-1.27 (d, 6H); ESIMS found C9H11BrN2O m/z 243.05(M+H).

Workup

washwashed with water
extractionThe organic extract
customwas dried
concentrationconcentrated
custompurified by column chromatography

Sources & evidence

ORD record: ord-6b10397c85624583bf0600a765df7c95
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09199991B2

Reaction notes

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