2,4-Dichlorobenzaldehyde → (S)-tert-Butyl 3-((2,4-dichlorobenzyl)amino)pyrrolidine-1-carboxylate

HRID 252085

Reaktionsgleichung

Reaktionsgleichung von HRID 252085
C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].[C:15]([O:19][C:20]([N:22]1[CH2:26][CH2:25][C@H:24]([NH2:27])[CH2:23]1)=[O:21])([CH3:18])([CH3:17])[CH3:16].[Cl:28][C:29]1[CH:36]=[C:35]([Cl:37])[CH:34]=[CH:33][C:30]=1[CH:31]=O>ClCCCl.ClCCl>[C:15]([O:19][C:20]([N:22]1[CH2:26][CH2:25][C@H:24]([NH:27][CH2:31][C:30]2[CH:33]=[CH:34][C:35]([Cl:37])=[CH:36][C:29]=2[Cl:28])[CH2:23]1)=[O:21])([CH3:18])([CH3:16])[CH3:17]

Komponenten

6

Versuchsvorschrift

Alternatively, add sodium triacetoxyborohydride (1.6 g, 7.6 mmol) to a mixture of (S)-3-aminopyrrolidine-1-carboxylic acid tert-butyl ester (1 g, 5.4 mmol) and 2,4-dichlorobenzaldehyde (2.8 g, 16.2 mmol) in 1,2-dichloroethane (10 mL) and stir overnight at room temperature. Dilute with dichloromethane and wash with saturated aqueous sodium chloride, dry (magnesium sulfate) concentrate and chromatograph on silica gel to give (S)-3-(2,4-dichlorobenzylamino)-pyrrolidine-1-carboxylic acid tert-butyl ester (865 mg, 33%). 1H NMR (400 MHz, CDCl3) 7.33-7.38 (2H, m), 7.23 (1H, d, J=7.82 Hz), 3.85 (2H, d, J=1.96 Hz), 3.45-3.56 (2H, m), 3.30-3.40 (2H, m), 3.19-3.10 (1H, m), 2.04 (1H, m), 1.74 (1H, m), 1.46 (9H, s), MS (ES): m/z=345 [M+].

Aufarbeitung

  1. washwash with saturated aqueous sodium chloride
  2. dry with materialdry (magnesium sulfate)
  3. concentrationconcentrate

Quellen und Nachweise

ORD-Eintrag
ord-fe6f6a67c45741deb82c820dec456437
Quelldatensatz
uspto-grants-2011_01
Patentnummer
US07868014B2

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