Acetic Acid → Zinc copper couple

HRID 1251978Notes

Reaction equation

HRID 1251978 reaction equation
S([O-])([O-])(=O)=O.[Cu+2:6].[Zn:7].[CH2:8]([S:15][C:16]1[N:26]=[C:19]2[N:20]=[C:21]([Cl:25])[CH:22]=[C:23](Cl)[N:18]2[N:17]=1)[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.C(O)(=O)C>O.CO.O1CCCC1>[Cu:6].[Zn:7].[CH2:8]([S:15][C:16]1[N:26]=[C:19]2[N:20]=[C:21]([Cl:25])[CH:22]=[CH:23][N:18]2[N:17]=1)[C:9]1[CH:10]=[CH:11][CH:12]=[CH:13][CH:14]=1

Participants

9

Reactant 4

HCID 176Acetic AcidHCID 23994ZincHCID 24462Copper SulfateHCID 10519059HCID 10519059, compound

Product 2

HCID 10290809Zinc copper coupleHCID 10516623HCID 10516623, compound

Reagents, catalysts & solvents 3

HCID 887MethanolSolventHCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

A zinc-copper couple was prepared following the procedure of Bradley (J. Org. Chem. 31, 626 (1966)) by stirring 1.0 g of copper sulfate in 20 ml of water with 15.0 g of zinc dust for 2 hours. The couple collected by filtration, washed with acetone and dried overnight under vacuum at 100° C. To a solution of 33.0 g (106 mmol) of 2-benzylthio-5,7-dichloro-1,2,4-triazolo[1,5-a]pyrimidine in 12.5 ml (213 mmol) of acetic acid, 50 ml of methanol and 300 ml of tetrahydrofuran was added 20.5 g of Zn-Cu couple. The mixture was stirred overnight at 22°-23° C. When the reaction was complete (TLC analysis) the reaction mixture was filtered through celite and the filtrate was concentrated by evaporation at reduced pressure. The residue was triturated with hexane to separate a solid. The solid was collected by filtration to yield the desired product as 26.5 g (92%) of orange solid, m.p. 125°-127° C. IR and 1H NMR spectra were in agreement with the assigned structure.

Workup

  1. filtrationThe couple collected by filtration
  2. washwashed with acetone
  3. customdried overnight under vacuum at 100° C
  4. filtrationwas filtered through celite
  5. concentrationthe filtrate was concentrated by evaporation at reduced pressure
  6. customThe residue was triturated with hexane
  7. customto separate a solid
  8. filtrationThe solid was collected by filtration

Sources & evidence

ORD record
ord-fe3afda3f475423e8214ab9d1761d7b7
Source dataset
uspto-grants-1988_05
Patent number
US04741764

Reaction notes

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