Hydrochloric Acid → 4-Methanesulfonyloxy-2-methyl-pyrrolidine-1-carboxylic Acid T-butyl Ester

HRID 1454262Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1454262
[C:1]([O:5][C:6]([N:8]1[CH2:12][CH:11]([OH:13])[CH2:10][CH:9]1[CH3:14])=[O:7])([CH3:4])([CH3:3])[CH3:2].C(N(CC)CC)C.[CH3:22][S:23](Cl)(=[O:25])=[O:24].Cl>C(Cl)Cl.CCCCCC.C(OCC)(=O)C>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH:11]([O:13][S:23]([CH3:22])(=[O:25])=[O:24])[CH2:10][CH:9]1[CH3:14])=[O:7])([CH3:4])([CH3:2])[CH3:3]

Komponenten

7

Edukt 4

HCID 313Hydrochloric AcidHCID 8471TriethylamineHCID 31297Methanesulfonyl chlorideHCID 14117009tert-Butyl 4-hydroxy-2-methylpyrrolidine-1-carboxylate

Produkt 1

HCID 197903964-Methanesulfonyloxy-2-methyl-pyrrolidine-1-carboxylic Acid T-butyl Ester

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6344DichloromethaneLösungsmittelHCID 21226206Ethyl acetate hexaneLösungsmittel

Versuchsvorschrift

The 4-hydroxy-2-methyl-pyrrolidine-1-carboxylic acid t-butyl ester (110.89 mg, 0.55 mmol) was dissolved in anhydrous DCM and triethylamine (166.96 mg, 1.65 mmol, 0.23 mL) was added under argon. The reaction mixture was cooled to 0EC and methanesulfonyl chloride (69.30 mg, 0.61 mmol, 0.05 mL) was added via syringe. The reaction was stirred at 0EC for 30 min and then allowed to warm to room temp and stir for 12 h. The reaction was slowly poured into a 1N HCl solution and the aqueous layer was extracted three times with ethyl acetate. The combined organic layers were washed with water and brine then dried over MgSO4. The solution was filtered and the solvent removed under reduced pressure. The product was isolated by flash chromatography. (3:1 hexane-ethyl acetate) Yield 135.21 mg. 1H NMR (CDCl3, 300 MHz): δ 1.27 (D, J=9 Hz, 3H), 1.48 (s, 9H), 1.81-1.92 (m, 1H), 2.43 (bs, 1H), 3.04 (s, 3H), 3.56 (dd, J=7.17 Hz, 1H), 3.84 (bs, 1H), 4.01 (bs, 1H), 5.17 (bs, 1H).

Aufarbeitung

  1. additionwas added via syringe
  2. stirringstir for 12 h
  3. extractionthe aqueous layer was extracted three times with ethyl acetate
  4. washThe combined organic layers were washed with water and brine
  5. dry with materialthen dried over MgSO4
  6. filtrationThe solution was filtered
  7. customthe solvent removed under reduced pressure
  8. customThe product was isolated by flash chromatography

Quellen und Nachweise

ORD-Eintrag
ord-ff2e960f161a48d2a8208d1b3906071c
Quelldatensatz
uspto-grants-2009_01
Patentnummer
US07479495B2

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