Citric Acid → cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonylamino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylic acid

HRID 927944Notes

Reaction equation

HRID 927944 reaction equation
[OH-].[Li+].[F:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[S:10]([NH:13][C:14]1[C:23]([C:24]([O:26]C)=[O:25])=[C:22]2[C:17]([C@H:18]3[CH2:30][CH2:29][O:28][C@H:19]3[CH2:20][O:21]2)=[CH:16][CH:15]=1)(=[O:12])=[O:11].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O1CCOCC1.O>[F:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[S:10]([NH:13][C:14]1[C:23]([C:24]([OH:26])=[O:25])=[C:22]2[C:17]([C@H:18]3[CH2:30][CH2:29][O:28][C@H:19]3[CH2:20][O:21]2)=[CH:16][CH:15]=1)(=[O:12])=[O:11]

Participants

6

Reactant 3

HCID 311Citric AcidHCID 3939Lithium HydroxideHCID 86713300methyl cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonylamino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate2×

Product 1

HCID 86713246cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonylamino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylic acidYield 247.2%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Procedure

A mixture of lithium hydroxide (0.5 g) and methyl cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonyl-amino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylate (Intermediate 58, 0.217 g) in a mixture of dioxane (13 mL) and water (4 mL) was divided between two microwave vials and the mixtures were irradiated in the microwave at 150° C. for 10 minutes. After cooling, the combined mixture was acidified by addition of 10% aqueous citric acid (2 mL), extracted with DCM, dried (MgSO4) and filtered. The filtrate was evaporated to dryness to give cis-(3aRS,9bRS)-7-(2-fluorobenzenesulfonylamino)-1,3a,4,9b-tetrahydro-2H-furo[2,3-c]chromene-6-carboxylic acid (0.518 g) as a glass.

Workup

  1. customthe mixtures were irradiated in the microwave at 150° C. for 10 minutes
  2. temperatureAfter cooling
  3. extractionextracted with DCM
  4. dry with materialdried (MgSO4)
  5. filtrationfiltered
  6. customThe filtrate was evaporated to dryness

Sources & evidence

ORD record
ord-af808e6bb8e7448eb514f13a9e642a3b
Source dataset
uspto-grants-2016_03
Patent number
US09290472B2

Reaction notes

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