Hydrochloric Acid → HCID 22278800, compound

HRID 1063260Notes

Reaction equation

HRID 1063260 reaction equation
N[C:2]1[C:3]([C:12]2[N:13]=[C:14]([CH2:26][CH3:27])[C:15]([NH:20][CH:21]([CH2:24][CH3:25])[CH2:22][CH3:23])=[N:16][C:17]=2[CH2:18][CH3:19])=[CH:4][C:5]2[CH2:6][CH2:7][CH2:8][CH2:9][C:10]=2[CH:11]=1.[ClH:28].N([O-])=O.[Na+]>O.Cl[Cu]>[Cl:28][C:2]1[C:3]([C:12]2[N:13]=[C:14]([CH2:26][CH3:27])[C:15]([NH:20][CH:21]([CH2:24][CH3:25])[CH2:22][CH3:23])=[N:16][C:17]=2[CH2:18][CH3:19])=[CH:4][C:5]2[CH2:6][CH2:7][CH2:8][CH2:9][C:10]=2[CH:11]=1

Participants

6

Reactant 3

HCID 313Hydrochloric Acid2×HCID 22278747HCID 22278747, compoundHCID 23668193Sodium Nitrite

Product 1

HCID 22278800HCID 22278800, compoundYield 4%

Reagents, catalysts & solvents 2

HCID 62652Cuprous chlorideCatalystHCID 962WaterSolvent

Conditions

Temperature
0 °C

Procedure

A 50 mL round bottom flask equipped with a magnetic stir bar was charged with 5-(3-amino-5,6,7,8-tetrahydronaphthalen-2-yl)-3,6-diethyl-N-(1-ethylpropyl)pyrazin-2-amine (118 mg, 0.32 mmol), con. HCl (3.41 mL) and cooled with an ice bath for 30 minutes. The solution was yellow. A cold solution of NaNO2 (22.4 mg, 0.325 mmol) in H2O (0.64 mL) was added and the mixture stirred at 0° C. for 30 minutes. A light precipitate was observed. A cold CuCl (38.2 mg, 0.386 mmol) solution in con. HCl (0.853 mL) was added and the mixture continued to stir at 0° C. for 20 minutes. The reaction turned dark. The cooling bath was removed, and after stirring at ambient temperature for 2 hours the color lightened and gas evolution was observed. The reaction was then heated to 60° C. for 20 minutes. More gas evolution was observed. After heating the reaction became clumpy. It was cooled with an ice bath and basified with aq. NaOH. The reaction turned blue/green in color. The now basic reaction mixture was diluted with water, extracted three times with CH2Cl2, the organics were combined, dried with Na2SO4, filtered and concentrated to 110 mg of a crude brown oil. PREP TLC followed by silica gel chromatography (4.5 g) using toluene) gave 4.45 mg (4%) of 5-(3-chloro-5,6,7,8-tetrahydronaphthalen-2-yl)-3,6-diethyl-N-(1-ethylpropyl)pyrazin-2-amine as a yellow oil. Rf 0.16 (toluene). OAMS supporting ions at: ESI+386.1. HRMS (ESI) calcd for C23H32N3CL+H1 386.2363, found 386.2358.

Workup

  1. customA 50 mL round bottom flask equipped with a magnetic stir bar
  2. stirringto stir at 0° C. for 20 minutes
  3. customThe cooling bath was removed
  4. stirringafter stirring at ambient temperature for 2 hours the color
  5. temperatureThe reaction was then heated to 60° C. for 20 minutes
  6. temperatureAfter heating the reaction
  7. temperatureIt was cooled with an ice bath
  8. additionThe now basic reaction mixture was diluted with water
  9. extractionextracted three times with CH2Cl2
  10. dry with materialdried with Na2SO4
  11. filtrationfiltered
  12. concentrationconcentrated to 110 mg of a crude brown oil

Sources & evidence

ORD record
ord-38c872760707419d98319eac6652cf68
Source dataset
uspto-grants-2005_11
Patent number
US06964965B2

Reaction notes

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