Carbon tetrabromide → 3-Bromo-pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 383765Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 383765
C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.O[CH:21]1[CH2:25][CH2:24][N:23]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:22]1.C(Br)(Br)(Br)[Br:34]>C1COCC1>[Br:34][CH:21]1[CH2:25][CH2:24][N:23]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:22]1

Komponenten

5

Edukt 3

HCID 11205Carbon tetrabromideHCID 11776TriphenylphosphineHCID 44169391-Boc-3-pyrrolidinol

Produkt 1

HCID 426142173-Bromo-pyrrolidine-1-carboxylic acid tert-butyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

Triphenylphosphine (727 mg, 2.77 mmol) was added to a stirred solution of tert-butyl 3-hydroxypyrrolidine-1-carboxylate (173 mg, 0.924 mmol) and carbon tetrabromide (919 mg, 2.77 mmol) in THF (3.00 mL) at 0° C., and the resulting mixture was allowed to warm slowly to rt. After 20 h, the reaction was filtered and concentrated in vacuo. Purification of the crude residue by flash chromatography on silica gel (gradient elution; 10%-40% EtOAc/hexanes as eluent) afforded the title compound i-5a m/z (ES) 250 (MH)+. 1H NMR (500 MHz, CDCl3): δ 4.49 (m, 1H), 3.81 (m, 2H), 3.63 (m, 1H), 3.53 (m, 1H), 2.33 (m, 1H), 2.26 (m, 1H), 1.49 (s, 9H).

Aufarbeitung

  1. filtrationthe reaction was filtered
  2. concentrationconcentrated in vacuo
  3. customPurification of the crude residue by flash chromatography on silica gel (gradient elution; 10%-40% EtOAc/hexanes as eluent)

Quellen und Nachweise

ORD-Eintrag
ord-d9d5c769ed264b0cb66639a014b0d06e
Quelldatensatz
uspto-grants-2013_02
Patentnummer
US08367679B2

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