Reaktion #3382

Reaktionsgleichung

HCl

nBuLi

3-bromoquinoline

1,2,3,5,6,7-hexahydropyrrolizinium perchlorate

→

solid

Ausbeute 48.5%

7a-(3-quinolinyl)-hexahydro-1H-pyrrolizine

Ausbeute 48.5%

Lösungsmittel

—

hexanes

THF

EtOAc

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter warming to ambient temperature
2. 2
   Sonstigethe phases were separated
3. 3
   Extraktionextracted with CH2Cl2 (3×)
4. 4
   Trocknendried (MgSO4)
5. 5
   Einengenconcentrated
6. 6
   Sonstigethe residue was chromatographed (silica gel; EtOAc)

Vorschrift

A solution of 2.5M nBuLi (1.2 mL, 2.8 mmol) in hexanes was added to 3-bromoquinoline (386 μL, 2.8 mmol) in THF (10 mL) at -100° C. followed immediately by 1,2,3,5,6,7-hexahydropyrrolizinium perchlorate (200 mg, 0.9 mmol). The reaction mixture was allowed to stir for 2 hours at -100° C. and then 2N HCl was added at 0° C. After warming to ambient temperature, the mixture was poured over EtOAc and the phases were separated. The aqueous phase was basified with 15% NaOH solution and extracted with CH2Cl2 (3×). The organic fractions were combined, dried (MgSO4) and concentrated, and the residue was chromatographed (silica gel; EtOAc) to afford a pale solid (104 mg, 46%). mp 80°-83° C. MS (CI/NH3) m/e: 239 (M+H)+. 1 H NMR (CDCl3, 300 MHz) δ1.61-1.75 (m, 2H), 1.83-1.94 (m, 2H), 2.03-2.17 (m, 4H), 2.71-2.80 (m, 2H), 3.20-3.27 (m, 2H), 7.52 (ddd, J=7.0, 7.0, 1.1 Hz, 1H), 7.65 (ddd, J=7.0, 7.0, 1.5 Hz, 1H), 7.82 (d, J=8.1 Hz, 1H), 8.05 (d, J=8.5 Hz, 1H), 8.32 (d, J=2.2, Hz, 1H), 8.97 (d, J=2.2 Hz, 1H).

Quelle