Sodium triacetoxyborohydride → 1-benzyl-N-(tetrahydro-2H-pyran-4-yl)-1H-1,2,3-triazol-5-amine

HRID 2062703Notes

Reaction equation

HRID 2062703 reaction equation
[CH2:1]([N:8]1[C:12]([NH2:13])=[CH:11][N:10]=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[O:14]1[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]1.O1C=CC(=O)C=C1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(O)(=O)C>[CH2:1]([N:8]1[C:12]([NH:13][CH:17]2[CH2:18][CH2:19][O:14][CH2:15][CH2:16]2)=[CH:11][N:10]=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 5049666Sodium triacetoxyborohydrideHCID 233617711-benzyl-1H-1,2,3-triazol-5-amineHCID 86644052tetrahydropyran 4H-pyran-4-one

Product 1

HCID 670089171-benzyl-N-(tetrahydro-2H-pyran-4-yl)-1H-1,2,3-triazol-5-amineYield 84%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

To a solution of 1-benzyl-1H-1,2,3-triazol-5-amine (835 mg) and tetrahydropyran-4H-pyran-4-one (481 mg) in acetic acid (10 mL) was added sodium triacetoxyborohydride (1.53 g), and the mixture was stirred at room temperature for 15 hr. The solvent was evaporated under reduced pressure, the residue was diluted with saturated aqueous sodium hydrogen carbonate solution, and the mixture was extracted with ethyl acetate-isopropyl alcohol (3:1). The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography [eluent: hexane/ethyl acetate=35/65→0/100 (volume ratio)], and crystallized from diisopropyl ether to give the title compound as pale-beige crystals (573 mg, 46%).

Workup

  1. customThe solvent was evaporated under reduced pressure
  2. additionthe residue was diluted with saturated aqueous sodium hydrogen carbonate solution
  3. extractionthe mixture was extracted with ethyl acetate-isopropyl alcohol (3:1)
  4. washThe extract was washed with saturated brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. customThe solvent was evaporated under reduced pressure
  7. customthe residue was purified by silica gel chromatography [eluent: hexane/ethyl acetate=35/65→0/100 (volume ratio)]
  8. customcrystallized from diisopropyl ether

Sources & evidence

ORD record
ord-c620343d156442279476ac73bd694019
Source dataset
uspto-grants-2012_10
Patent number
US08283353B2

Reaction notes

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