Triethylamine → 3-Oxocyclohex-1-enyl 2-chloro-4-methylsulfonyl-3-(3a,4,5,6a-tetra-hydrofuro[3,2-d]isoxazol-3-yl)benzoate

HRID 48144Notes

Reaction equation

HRID 48144 reaction equation
[Cl:1][C:2]1[C:10]([C:11]2[CH:15]3[CH2:16][CH2:17][O:18][CH:14]3[O:13][N:12]=2)=[C:9]([S:19]([CH3:22])(=[O:21])=[O:20])[CH:8]=[CH:7][C:3]=1[C:4]([O-:6])=[O:5].C(Cl)(=O)C(Cl)=O.[C:29]1(=O)[CH2:34][CH2:33][CH2:32][C:31](=[O:35])[CH2:30]1.C(N(CC)CC)C>ClCCl.CN(C)C=O>[Cl:1][C:2]1[C:10]([C:11]2[CH:15]3[CH2:16][CH2:17][O:18][CH:14]3[O:13][N:12]=2)=[C:9]([S:19]([CH3:22])(=[O:21])=[O:20])[CH:8]=[CH:7][C:3]=1[C:4]([O:6][C:29]1[CH2:34][CH2:33][CH2:32][C:31](=[O:35])[CH:30]=1)=[O:5]

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 104341,3-CyclohexanedioneHCID 65578Oxalyl chlorideHCID 22742128HCID 22742128, compound

Product 1

HCID 227421353-Oxocyclohex-1-enyl 2-chloro-4-methylsulfonyl-3-(3a,4,5,6a-tetra-hydrofuro[3,2-d]isoxazol-3-yl)benzoate

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideCatalystHCID 6344DichloromethaneSolvent2×

Procedure

58.0 g (167.8 mmol) of 2-chloro-4-methylsulfonyl-3-(3a,4,5,6a-tetrahydrofuro[3,2-d]isoxazol-3-yl)-benzoate are dissolved in 600 ml of dichloromethane, and 31.94 g (251.6 mmol) of oxalyl chloride and three drops of dimethylformamide are added at room temperature. After the evolution of gas has ceased (approx. 2 hours), the mixture is refluxed for a further hour. It is subsequently concentrated, and redissolved in 300 ml of dichloromethane. At 0-5° C., a mixture of 19.5 g (173.9 mmol) of 1,3-cyclohexanedione and 17.6 g (173.9 mmol) of triethylamine in 200 ml of dichlormethane is added dropwise. The mixture is stirred for 2 hours and then washed in succession with sodium carbonate solution and sodium chloride solution, and the organic phase is then dried over magnesium sulfate. After removal of the solvent, 64.5 g (87% of theory) of crude 3-oxocyclohex-1-enyl 2-chloro-4-methyl-sulfonyl-3-(3a,4,5,6a-tetrahydrofuro[3,2-d]isoxazol-3-yl)benzoate are obtained.

Workup

  1. custom(approx. 2 hours)
  2. temperaturethe mixture is refluxed for a further hour
  3. concentrationIt is subsequently concentrated
  4. dissolutionredissolved in 300 ml of dichloromethane
  5. additionis added dropwise
  6. washwashed in succession with sodium carbonate solution and sodium chloride solution
  7. dry with materialthe organic phase is then dried over magnesium sulfate
  8. customAfter removal of the solvent, 64.5 g (87% of theory) of crude 3-oxocyclohex-1-enyl 2-chloro-4-methyl-sulfonyl-3-(3a,4,5,6a-tetrahydrofuro[3,2-d]isoxazol-3-yl)benzoate
  9. customare obtained

Sources & evidence

ORD record
ord-bfcbbb292bd948e6963a66b154e4f82b
Source dataset
uspto-grants-2004_03
Patent number
US06703348B2

Reaction notes

Loading…