Triethylamine → 5-chloro-N,N-dimethylpyrazine-2-carboxamide

HRID 1253609Notes

Reaction equation

HRID 1253609 reaction equation
[Cl:1][C:2]1[N:3]=[CH:4][C:5]([C:8](Cl)=[O:9])=[N:6][CH:7]=1.Cl.[CH3:12][NH:13][CH3:14].C(N(CC)CC)C>ClCCl>[Cl:1][C:2]1[N:3]=[CH:4][C:5]([C:8]([N:13]([CH3:14])[CH3:12])=[O:9])=[N:6][CH:7]=1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 10473Dimethylamine, hydrochlorideHCID 152157435-Chloropyrazine-2-carbonyl chloride

Product 1

HCID 590004705-chloro-N,N-dimethylpyrazine-2-carboxamideYield 100.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent3×

Procedure

5-chloropyrazine-2-carbonyl chloride (2.13 gram, 12.05 mmol) and dimethylamine HCl salt (1.06 gram, 12.7 mmol) were suspended in dichloromethane (50 mL) with stirring. Triethylamine (5.04 mL, 36.2 mmol) in dichloromethane (25 mL) was added dropwise at 0° C. to the reaction mixture. The combined solution was warmed up to ambient temperature and stirred for 4 hours. The compound was diluted with dichloromethane, washed with 1N HCl, water, brine, dried (Na2SO4), filtered and concentrated. The crude product was purified by column chromatography (silica gel, gradient of 30 to 80% ethyl acetate in heptane) to provide desired 5-chloro-N,N-dimethylpyrazine-2-carboxamide (SM-1: 2.24 g, 85%). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 8.74 (d, J=1.37 Hz, 1H) 8.53 (d, J=1.37 Hz, 1H) 3.15 (s, 3H) 3.12 (s, 3H)

Workup

  1. stirringstirred for 4 hours
  2. washwashed with 1N HCl, water, brine
  3. dry with materialdried (Na2SO4)
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe crude product was purified by column chromatography (silica gel, gradient of 30 to 80% ethyl acetate in heptane)

Sources & evidence

ORD record
ord-c23d60c2c52e4fa2880cd9ce10fadd00
Source dataset
uspto-grants-2013_06
Patent number
US08455496B2

Reaction notes

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