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

HRID 2409352Notes

Reaction equation

HRID 2409352 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

5

Reactant 3

HCID 1049PyridineHCID 62325Isobutyryl chlorideHCID 8176813-Amino-5-bromopyridine

Product 1

HCID 68195778N-(5-bromopyridin-3-yl)-2-methylpropanamideYield 71%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
0 °C

Procedure

3-Amino-5-bromo pyridine (XXX) (1 eq) was dissolved in DCM and cooled to 0° C. before adding pyridine (2.2 eq) and isobutyryl chloride (XXXI) (1.1 eq). The reaction mixture was stirred at r.t. 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 (XXXII) as a 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

  1. washwashed with water
  2. extractionThe organic extract
  3. customwas dried
  4. concentrationconcentrated
  5. custompurified by column chromatography

Sources & evidence

ORD record
ord-b81362a09a644e0ca42eb96c1d5001ad
Source dataset
uspto-grants-2014_08
Patent number
US08815897B2

Reaction notes

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