Dimethylformamide → HCID 15296581, compound

HRID 1720583Notes

Reaction equation

HRID 1720583 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([S:9]([N:12]2[C@@H:16]([C:17](O)=[O:18])[C:15]([CH3:21])([CH3:20])[S:14][CH2:13]2)(=[O:11])=[O:10])=[CH:5][CH:4]=1.C(Cl)(=O)C(Cl)=O.CN(C)C=O.Cl.[NH2:34][OH:35].C(N(CC)CC)C>C(Cl)Cl.O1CCCC1.O>[OH:35][NH:34][C:17]([C@H:16]1[C:15]([CH3:21])([CH3:20])[S:14][CH2:13][N:12]1[S:9]([C:6]1[CH:7]=[CH:8][C:3]([O:2][CH3:1])=[CH:4][CH:5]=1)(=[O:11])=[O:10])=[O:18]

Participants

9

Reactant 5

HCID 6228DimethylformamideHCID 8471TriethylamineHCID 65578Oxalyl chlorideHCID 443297Hydroxyamine hydrochlorideHCID 22856284HCID 22856284, compound

Product 1

HCID 15296581HCID 15296581, compound

Reagents, catalysts & solvents 3

HCID 962WaterSolvent2×HCID 6344DichloromethaneSolvent2×HCID 8028TetrahydrofuranSolvent

Procedure

3-[4-Methoxybenzenesulfonyl]-5,5-dimethylthiazolidine-4(S)-carboxylic acid (2.0 g, 6.0 mmol) is dissolved in methylene chloride (30.0 mL). To this solution is added oxalyl chloride (1.1 mL, 12.1 mmol) and dimethylformamide (0.50 mL, 6.0 mmol), and the reaction is stirred at room temperature for 2 hours. Meanwhile, in a separate flask, hydroxylamine hydrochloride (1.74 g, 25.0 mmol) and triethylamine (5.0 mL, 36.0 mmol) are stirred in tetrahydrofuran (25.0 mL) and water (2.0 mL) at 0° C. for 15 minutes. After 2 hours, the methylene chloride solution is added in one portion to the second flask, and the combined contents are stirred overnight as the flask gradually warms up to room temperature. The reaction is then diluted with acidic water (pH=~3), and extracted several times with ethyl acetate. The combined organic layers are dried (Na2SO4), and the solvent is evaporated. The product is purified by silica gel chromatography (60% ethyl acetate/hexane) to give N-hydroxy-3-[4-methoxybenzenesulfonyl]-5,5-dimethyl-thiazolidine-4(S)-carboxamide, m.p. 68°-71 ° C.

Workup

  1. waitAfter 2 hours
  2. stirringthe combined contents are stirred overnight as the flask
  3. customgradually warms up to room temperature
  4. extractionextracted several times with ethyl acetate
  5. dry with materialThe combined organic layers are dried (Na2SO4)
  6. customthe solvent is evaporated
  7. customThe product is purified by silica gel chromatography (60% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-50d3df61fcd546e0927d730fc6df015e
Source dataset
uspto-grants-1996_04
Patent number
US05506242

Reaction notes

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