Diisopropylethylamine → (S)-tert-butyl 5-((S)-2-((R)-4-benzyl-2-oxooxazolidin-3-yl)-1-(3-chlorophenyl)-2-oxoethyl)-2,2-dimethylpyrrolidine-1-carboxylate

HRID 1480539Notes

Reaction equation

HRID 1480539 reaction equation
[CH2:1]([C@@H:8]1[CH2:12][O:11][C:10](=[O:13])[N:9]1[C:14](=[O:23])[CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([Cl:22])[CH:17]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CCN(C(C)C)C(C)C.CO[CH:35]1[N:39]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[C:38]([CH3:48])([CH3:47])[CH2:37][CH2:36]1>C(Cl)Cl.Cl[Ti](Cl)(Cl)Cl>[CH2:1]([C@@H:8]1[CH2:12][O:11][C:10](=[O:13])[N:9]1[C:14](=[O:23])[C@H:15]([C@H:35]1[N:39]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[C:38]([CH3:48])([CH3:47])[CH2:37][CH2:36]1)[C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([Cl:22])[CH:17]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 81531DiisopropylethylamineHCID 59564912HCID 59564912, compoundHCID 66845068HCID 66845068, compound

Product 1

HCID 66846240(S)-tert-butyl 5-((S)-2-((R)-4-benzyl-2-oxooxazolidin-3-yl)-1-(3-chlorophenyl)-2-oxoethyl)-2,2-dimethylpyrrolidine-1-carboxylateYield 62.9%

Reagents, catalysts & solvents 2

HCID 24193Titanium TetrachlorideCatalystHCID 6344DichloromethaneSolvent2×

Conditions

Temperature
-78 °C

Procedure

A solution of (R)-4-benzyl-3-(2-(3-chlorophenyl)acetyl)oxazolidin-2-one (0.975 g, 2.96 mmol) in dry DCM (125 mL) was cooled to −78° C., and TiCl4 (3.10 mL, 3.10 mmol) was added. DIEA (0.566 mL, 3.25 mmol) was added to this stirring cold solution for 15 minutes. A solution of tert-butyl 5-methoxy-2,2-dimethylpyrrolidine-1-carboxylate (0.881 g, 3.84 mmol) in DCM (20 mL) was added to the cold mixture. The reaction was stirred for 15 minutes at −78° C. and then warmed to −10° C. (ice/acetone) and stirred for 3 hours. The reaction was quenched with NH4Cl, diluted with DCM (50 mL), water (50 mL), and the layers were separated. The aqueous layer was extracted with DCM (25 mL), dried (MgSO4) and concentrated to an oil. TLC (10% ethyl acetate/hexanes) shows desired product at Rf˜0.2. Purification by flash chromatography (5% ethyl acetate/hexanes-10% ethyl acetate/hexanes) gave (S)-tert-butyl 5-((S)-2-((R)-4-benzyl-2-oxooxazolidin-3-yl)-1-(3-chlorophenyl)-2-oxoethyl)-2,2-dimethylpyrrolidine-1-carboxylate (0.98 g, 1.86 mmol, 62.9% yield). HPLC, 254 nm, 100% purity, retention time=3.86 minutes.

Workup

  1. stirringstirred for 3 hours
  2. customThe reaction was quenched with NH4Cl
  3. additiondiluted with DCM (50 mL), water (50 mL)
  4. customthe layers were separated
  5. extractionThe aqueous layer was extracted with DCM (25 mL)
  6. dry with materialdried (MgSO4)
  7. concentrationconcentrated to an oil
  8. customPurification by flash chromatography (5% ethyl acetate/hexanes-10% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-fb6d28890d424f60932955f9385096b9
Source dataset
uspto-grants-2016_08
Patent number
US09409886B2

Reaction notes

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