Water → ethyl (2R)-2-benzoyloxymethyl-8-[N-(2-chloro-4-fluorophenyl)sulfamoyl]-1,4-dioxaspiro[4.5]dec-6-ene-7-carboxylate

HRID 2191153Notes

Reaction equation

HRID 2191153 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[NH:9][S:10]([CH:13]1[C:18]([C:19]([O:21][CH2:22][CH3:23])=[O:20])=[CH:17][C:16](=[O:24])[CH2:15][CH2:14]1)(=[O:12])=[O:11].[C:25]([O:33][CH2:34][C@H:35](O)[CH2:36][OH:37])(=[O:32])[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1.C(O[Si](C)(C)C)(C)C.O>ClCCl.FC(F)(F)S(O[Si](C)(C)C)(=O)=O>[C:25]([O:33][CH2:34][C@H:35]1[CH2:36][O:37][C:16]2([CH2:15][CH2:14][CH:13]([S:10](=[O:12])(=[O:11])[NH:9][C:3]3[CH:4]=[CH:5][C:6]([F:8])=[CH:7][C:2]=3[Cl:1])[C:18]([C:19]([O:21][CH2:22][CH3:23])=[O:20])=[CH:17]2)[O:24]1)(=[O:32])[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1

Participants

7

Reactant 4

HCID 962WaterHCID 74578Trimethyl(1-methylethoxy)silaneHCID 928191(R)-2,3-dihydroxypropyl benzoateHCID 57870910Ethyl 6-(N-(2-chloro-4-fluorophenyl)sulfamoyl)-3-oxocyclohex-1-ene-1-carboxylate

Product 1

HCID 67190332ethyl (2R)-2-benzoyloxymethyl-8-[N-(2-chloro-4-fluorophenyl)sulfamoyl]-1,4-dioxaspiro[4.5]dec-6-ene-7-carboxylateYield 81%

Reagents, catalysts & solvents 2

HCID 65367Trimethylsilyl triflateCatalystHCID 6344DichloromethaneSolvent

Procedure

100 mg (0.27 mmol) of ethyl 6-[N-(2-chloro-4-fluorophenyl)sulfamoyl]-3-oxo-1-cyclohexene-1-carboxylate obtained in Example 7 and 69 mg (0.35 mmol) of (R)-2,3-dihydroxypropyl benzoate were dissolved in 2 ml of dichloromethane and 0.19 ml (1.05 mmol) of isopropoxytrimethylsilane and 2 μl (0.014 mmol) of trimethylsilyl trifluoromethanesulfonate were sequentially added thereto with stirring under ice-cooling, followed by stirring at the same temperature for 1 hour. Water was added to the reaction solution and the mixture was extracted with ethyl acetate. The organic layer was washed with water and dried over anhydrous magnesium sulfate, followed by concentration under reduced pressure. The residue was subjected to silica gel column chromatography (solvent; hexane:ethyl acetate 1:1), to give 121 mg of ethyl (2R)-2-benzoyloxymethyl-8-[N-(2-chloro-4-fluorophenyl)sulfamoyl]-1,4-dioxaspiro[4.5]dec-6-ene-7-carboxylate as a pale yellow oil (yield: 81%).

Workup

  1. temperaturecooling
  2. stirringby stirring at the same temperature for 1 hour
  3. extractionthe mixture was extracted with ethyl acetate
  4. washThe organic layer was washed with water
  5. dry with materialdried over anhydrous magnesium sulfate
  6. concentrationfollowed by concentration under reduced pressure

Sources & evidence

ORD record
ord-8f3d18e68b084a9791f1d8db8db62dfb
Source dataset
uspto-grants-2012_12
Patent number
USRE043858E1

Reaction notes

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