Allyltributylstannane → 5-Allyl-2,1,3-benzoxadiazole

HRID 1474347Notes

Reaction equation

HRID 1474347 reaction equation
Br[C:2]1[CH:10]=[CH:9][C:5]2=[N:6][O:7][N:8]=[C:4]2[CH:3]=1.[Cl-].[Li+].[CH2:13]([Sn](CCCC)(CCCC)CCCC)[CH:14]=[CH2:15]>C1(C)C=CC=CC=1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:15]([C:2]1[CH:10]=[CH:9][C:5]2=[N:6][O:7][N:8]=[C:4]2[CH:3]=1)[CH:14]=[CH2:13]

Participants

6

Reactant 3

HCID 90628AllyltributylstannaneHCID 433294Lithium ChlorideHCID 27762985-Bromo-2,1,3-benzoxadiazole

Product 1

HCID 595687145-Allyl-2,1,3-benzoxadiazole

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 1140TolueneSolvent

Procedure

5-Bromo-2,1,3-benzoxadiazole (10 g, 50.3 mmol) was dissolved in toluene (300 mL) and treated with lithium chloride (6.39 g, 151 mmol), Pd(Ph3P)4 (2.90 g, 2.51 mmol), and allyltributylstannane (18.66 ml, 60.3 mmol). Degassed and refluxed the mixture under N2 for 3 hrs. The reaction mixture turned black. Poured the reaction mixture into water and extracted with ethyl acetate. The organic layer was separated, washed with brine, dried, and evaporated to dryness. The residue was chromatographed through 120 g ISCO Redi-Sep column and eluted with 0-10% ethyl acetate/hexane to yield 5-(prop-2-en-1-yl)-2,1,3-benzoxadiazole.

Workup

  1. customDegassed
  2. temperaturerefluxed the mixture under N2 for 3 hrs
  3. additionPoured the reaction mixture into water
  4. extractionextracted with ethyl acetate
  5. customThe organic layer was separated
  6. washwashed with brine
  7. customdried
  8. customevaporated to dryness
  9. customThe residue was chromatographed through 120 g ISCO Redi-Sep column
  10. washeluted with 0-10% ethyl acetate/hexane

Sources & evidence

ORD record
ord-a4a5c502e10b4191b1b903c0d609fe21
Source dataset
uspto-grants-2015_04
Patent number
US09018211B2

Reaction notes

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