Water → HCID 89784748, compound

HRID 1056161Notes

Reaction equation

HRID 1056161 reaction equation
[Br:1][C:2]1[CH:11]=[CH:10][CH:9]=[C:8]2[C:3]=1[N:4]=[C:5]([Cl:13])[C:6](Cl)=[N:7]2.[CH3:14][C:15]([NH2:18])([CH3:17])[CH3:16].O.BrC1C=CC=C2C=1N=C(NC(C)(C)C)C(Cl)=N2>CS(C)=O.C([O-])(O)=O.[Na+]>[Br:1][C:2]1[CH:11]=[CH:10][CH:9]=[C:8]2[C:3]=1[N:4]=[C:5]([Cl:13])[C:6]([NH:18][C:15]([CH3:17])([CH3:16])[CH3:14])=[N:7]2

Participants

7

Reactant 4

HCID 962WaterHCID 6385Tert-Butylamine2×HCID 337783211092286-00-4HCID 89783537HCID 89783537, compound

Product 1

HCID 89784748HCID 89784748, compoundYield 65%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 516892Sodium BicarbonateSolvent

Conditions

Temperature
100 °C

Procedure

A solution of 5-bromo-2,3-dichloroquinoxaline (LeadGen Labs, LLC, Orange, Conn.) (305 mg, 1.10 mmol) and 2-methylpropan-2-amine (Aldrich) (0.12 mL, 1.10 mmol) in DMSO (5.0 mL) was stirred under argon at 65° C. for 17 h (water-cooled reflux condenser attached to flask). Additional 2-methylpropan-2-amine (0.06 mL, 0.57 mmol) was added, and the resulting solution was stirred at 100° C. for 5 h. The reaction mixture was subsequently cooled to 25° C. and diluted with half-saturated aq. NaHCO3 (80 mL). The resulting mixture was extracted with DCM (2×80 mL), and the combined extracts were sequentially washed with water (2×50 mL), dried over Na2SO4, filtered, and concentrated onto silica gel. Chromatographic purification (silica gel, 0-10% EtOAc/hexanes) furnished a ˜2.5:1 mixture of 8-bromo-N-(tert-butyl)-3-chloroquinoxalin-2-amine and 5-bromo-N-(tert-butyl)-3-chloroquinoxalin-2-amine (224 mg, 0.71 mmol, 65% yield) as an off-white solid: 8-bromo-N-(tert-butyl)-3-chloroquinoxalin-2-amine: 1H NMR (400 MHz, CDCl3) δ ppm 7.86 (1H, dd, J=7.6, 1.0 Hz), 7.72 (1H, dd, J=8.2, 1.0 Hz), 7.21 (1H, t, J=7.9 Hz), 5.63 (1H, br. s.), 1.63 (9H, s). m/z (ESI, +ve) 314.0 (M+H)+. 5-bromo-N-(tert-butyl)-3-chloroquinoxalin-2-amine: 1H NMR (400 MHz, CDCl3) δ ppm 7.65 (1H, d, J=3.7 Hz), 7.63 (1H, d, J=3.3 Hz), 7.39 (1H, t, J=8.0 Hz), 5.60 (1H, br. s.), 1.57 (9H, s). m/z (ESI, +ve) 314.0 (M+H)+.

Workup

  1. temperatureThe reaction mixture was subsequently cooled to 25° C.
  2. extractionThe resulting mixture was extracted with DCM (2×80 mL)
  3. washthe combined extracts were sequentially washed with water (2×50 mL)
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated onto silica gel
  7. customChromatographic purification (silica gel, 0-10% EtOAc/hexanes)
  8. customfurnished

Sources & evidence

ORD record
ord-1b31e51f07eb412b844f4aa79f716f7b
Source dataset
uspto-grants-2016_07
Patent number
US09394297B2

Reaction notes

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