2-Fluorobenzenesulphonyl chloride → methyl cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonylamino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate

HRID 927945Notes

Reaction equation

HRID 927945 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[S:8](Cl)(=[O:10])=[O:9].[NH2:12][C:13]1[C:22]([C:23]([O:25][CH3:26])=[O:24])=[C:21]2[C:16]([C@H:17]3[CH2:29][CH2:28][O:27][C@H:18]3[CH2:19][O:20]2)=[CH:15][CH:14]=1>C(Cl)Cl.N1C=CC=CC=1>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[S:8]([NH:12][C:13]1[C:22]([C:23]([O:25][CH3:26])=[O:24])=[C:21]2[C:16]([C@H:17]3[CH2:29][CH2:28][O:27][C@H:18]3[CH2:19][O:20]2)=[CH:15][CH:14]=1)(=[O:10])=[O:9]

Participants

5

Reactant 2

HCID 1377612-Fluorobenzenesulphonyl chlorideHCID 86713281methyl cis-(3aRS,9bRS)-7-amino-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate2×

Product 1

HCID 86713300methyl cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonylamino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylateYield 66.3%

Reagents, catalysts & solvents 2

HCID 1049PyridineSolventHCID 6344DichloromethaneSolvent

Procedure

2-Fluorobenzenesulfonyl chloride (0.5 g) was added to a solution of methyl cis-(3aRS,9bRS)-7-amino-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate (Intermediate 19, 0.53 g) in DCM (10 mL) and pyridine (20 mL) and the resultant mixture was stirred at room temperature for 48 hours. The mixture was evaporated to dryness and the residue was treated with water, extracted with DCM, dried (MgSO4) and filtered. The filtrate was evaporated to dryness and the residue was purified by chromatography on silica, eluting with a mixture of ethyl acetate and cyclohexane with a gradient of 0-60% to give methyl cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonylamino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate (0.574 g) as a pale yellow solid.

Workup

  1. customThe mixture was evaporated to dryness
  2. additionthe residue was treated with water
  3. extractionextracted with DCM
  4. dry with materialdried (MgSO4)
  5. filtrationfiltered
  6. customThe filtrate was evaporated to dryness
  7. customthe residue was purified by chromatography on silica
  8. washeluting with a mixture of ethyl acetate and cyclohexane with a gradient of 0-60%

Sources & evidence

ORD record
ord-63701c34ae034484a4abc7f9c4fff0fe
Source dataset
uspto-grants-2016_03
Patent number
US09290472B2

Reaction notes

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