Benzyl chloroformate → Benzyl 3-bromopropylcarbamate

HRID 36182

Reaktionsgleichung

Reaktionsgleichung von HRID 36182
Br.[Br:2][CH2:3][CH2:4][CH2:5][NH2:6].Cl[C:8]([O:10][CH2:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)=[O:9].C(N(C(C)C)CC)(C)C>C1COCC1>[CH2:11]([O:10][C:8]([NH:6][CH2:5][CH2:4][CH2:3][Br:2])=[O:9])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1

Komponenten

5

Edukt 3

HCID 10387Benzyl chloroformateHCID 787013-Bromopropylamine hydrobromideHCID 81531Diisopropylethylamine

Produkt 1

HCID 254436Benzyl 3-bromopropylcarbamateAusbeute 62,7 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

To a stirred suspension of 3-bromopropylamine hydrobromide (2 g, 9.14 mM) in 40 mL dry THF was added, via hypodermic syringe, benzyl chloroformate (1.64 g, 9.60 mM) at room temperature. After cooling to 0° C., diisopropylethylamine (1.6 mL, 9.20 mM) was added dropwise via syringe and the reaction mixture was allowed to stir at 0° C. for 1 hour. The crude reaction mixture was filtered over a pad of Celite and solvents were evaporated. The residue was flash chromatographed on silica gel, eluting with 10-20-30% EtOAc/hexane to afford 1.56 g desired product as a liquid, homogeneous by TLC in 80:20 hexane-EtOAc;

Aufarbeitung

  1. additionwas added, via hypodermic syringe
  2. customat room temperature
  3. customThe crude reaction mixture
  4. filtrationwas filtered over a pad of Celite and solvents
  5. customwere evaporated
  6. customchromatographed on silica gel
  7. washeluting with 10-20-30% EtOAc/hexane

Quellen und Nachweise

ORD-Eintrag
ord-e1b2cbc13a4d4e269a66fa91b9949ec9
Quelldatensatz
uspto-grants-1995_05
Patentnummer
US05411980

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