Reaktion #417603

Reaktionsgleichung

1-benzyl-4-morpholino-1,2,3,6-tetrahydropyridine

9-BBN

→

1 -benzyl-1,2,3,6-tetrahydropyridine

Ausbeute 85.0%

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeA suspension results which
2. 2
   SonstigeThe THF is removed under reduced pressure (20 Torr) and 2 ml of methanol
3. 3
   workup.ADDITIONis added to the remaining solid
4. 4
   SonstigeAn exothermic reaction
5. 5
   Temperaturby gentle warming
6. 6
   Sonstigeresults in a clear solution which
7. 7
   workup.STIRRINGis stirred
8. 8
   Temperaturthe mixture is cooled slowly
9. 9
   Sonstigeto crystallize the by-product, B-(morpholino)-9-BBN methanol complex
10. 10
    SonstigeThe solid is triturated with n-pentane (3×30 ml)
11. 11
    Waschenthe combined pentane layers are washed successively with water (3×10 ml), 3N sodium hydroxide (3×6 ml) and water (2×10 ml)
12. 12
    SonstigeThe pentane layer is evaporated
13. 13
    workup.DISTILLATIONThe residue is purified by distillation

Vorschrift

A solution of 5.16 g (20 mmoles) of 1-benzyl-4-morpholino-1,2,3,6-tetrahydropyridine in 10 ml of tetrahydrofuran (THF) is added to 2.44 g (20 mmoles) of solid 9-BBN. A suspension results which becomes clear after stirring for 6 hours at 25° C. The THF is removed under reduced pressure (20 Torr) and 2 ml of methanol is added to the remaining solid. An exothermic reaction is initiated by gentle warming and results in a clear solution which is stirred. The stirring is stopped and the mixture is cooled slowly to crystallize the by-product, B-(morpholino)-9-BBN methanol complex. The solid is triturated with n-pentane (3×30 ml) and the combined pentane layers are washed successively with water (3×10 ml), 3N sodium hydroxide (3×6 ml) and water (2×10 ml). The pentane layer is evaporated. The residue is purified by distillation to give 2.90 g (85 percent yield based on 1-benzyl-4-morpholino-1,2,3,6-tetrahydropyridine) of 1 -benzyl-1,2,3,6-tetrahydropyridine, boiling point 98° C.-100° C. at 1 Torr.

Quelle