Sodium methanesulfinate → [(R)-4-(3-methanesulfonyl-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester

HRID 1645155Notes

Reaction equation

HRID 1645155 reaction equation
[CH2:1]([O:3][C:4](=[O:30])[CH2:5][N:6]1[C:14]2[CH2:13][CH2:12][CH2:11][C@@H:10]([NH:15][S:16]([C:19]3[CH:24]=[C:23]([C:25]([F:28])([F:27])[F:26])[CH:22]=[C:21](Br)[CH:20]=3)(=[O:18])=[O:17])[C:9]=2[CH:8]=[N:7]1)[CH3:2].[Na+].[CH3:32][S:33]([O-:35])=[O:34].[Na+].N1CCC[C@H]1C([O-])=O>CS(C)=O.O.[Cu]I>[CH2:1]([O:3][C:4](=[O:30])[CH2:5][N:6]1[C:14]2[CH2:13][CH2:12][CH2:11][C@@H:10]([NH:15][S:16]([C:19]3[CH:24]=[C:23]([C:25]([F:28])([F:27])[F:26])[CH:22]=[C:21]([S:33]([CH3:32])(=[O:35])=[O:34])[CH:20]=3)(=[O:18])=[O:17])[C:9]=2[CH:8]=[N:7]1)[CH3:2]

Participants

7

Reactant 3

HCID 2733271Sodium methanesulfinateHCID 23678551L-Proline sodium saltHCID 44611775HCID 44611775, compound

Product 1

HCID 59152955[(R)-4-(3-methanesulfonyl-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl esterYield 51.1%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 679Dimethyl SulfoxideSolventHCID 962WaterSolvent2×

Conditions

Temperature
150 °C

Procedure

[(R)-4-(3-Bromo-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester (118.0 mg, 0.20 mmol), methanesulfinic acid sodium salt (24.5 mg, 0.24 mmol), copper(I) iodide (4.0 mg, 0.02 mmol) and L-proline sodium salt (3.2 mg, 0.04 mmol) were dissolved in dimethyl sulfoxide (1.5 mL) and water (0.3 mL). The mixture was heated in a microwave oven at 150° C. for 30 minutes. The resulting mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate, concentrated and purified by column chromatography (gradient elution, 0-5% methanol in dichloromethane) to afford [(R)-4-(3-methanesulfonyl-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester (52.0 mg, 51.1%) as a white solid. MS calcd. for C19H22F3N3O6S2 509, obsd. (ESI+) [(M+H)+] 510.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe organic layer was washed with brine
  3. dry with materialdried over sodium sulfate
  4. concentrationconcentrated
  5. custompurified by column chromatography (gradient elution, 0-5% methanol in dichloromethane)

Sources & evidence

ORD record
ord-cf884dbf029d4dd39b18463c1d68e255
Source dataset
uspto-grants-2012_02
Patent number
US08124641B2

Reaction notes

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