Reaktion #1822640

Reaktionsgleichung

dicyclopropylmethyl alcohol

NaN3

NaBH4

CCl3CO2H

→

salt

Ausbeute 35.0%

Dicyclopropylmethyl Amine Hydrochloride

Ausbeute 35.0%

Lösungsmittel

CH2Cl2

H2O

CH2Cl2

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   Waschenwashed with NaHCO3 and NaCl solution
2. 2
   TrocknenDrying over MgSO4 and removal of solvent
3. 3
   Sonstigegave an oil (which
4. 4
   workup.STIRRINGThe mixture was stirred at 80° C. for 16 h
5. 5
   Sonstigelayers separated
6. 6
   Extraktionthe organic layer extracted with 10 % HCl
7. 7
   Extraktionextracted with ether
8. 8
   TrocknenAfter drying over MgSO4, HCl gas
9. 9
   Sonstigewas bubbled through the solution
10. 10
    Sonstigethe amine hydrochloride salt which had precipitated
11. 11
    Filtrationwas collected by filtration
12. 12
    Sonstigerecrystallized from ether/MeOH

Vorschrift

To a solution of 4.48 g of dicyclopropylmethyl alcohol in 20 mL of CH2Cl2 was added 3.6 g of NaN3 followed by 10 g of CCl3CO2H. The resulting mixture was stirred at room temperature for 3 h, diluted with 50 mL of CH2Cl2, washed with NaHCO3 and NaCl solution. Drying over MgSO4 and removal of solvent gave an oil (which was examined by high field 1H NMR and shown to be contaminated by a small amount of ring-opening compound (less than 5%)) which was dissolved in a solution of 7 mL of toluene containing 2.5 g of hexadecyltributyl phosphonium bromide. To the solution was added 5 g of NaBH4 in 15 mL of H2O through a dropping funnel over 30 min. The mixture was stirred at 80° C. for 16 h, layers separated and the organic layer extracted with 10 % HCl. The pH of the aqueous solution was adjusted to 8-9 with NaOH and extracted with ether. After drying over MgSO4, HCl gas was bubbled through the solution and the amine hydrochloride salt which had precipitated was collected by filtration and recrystallized from ether/MeOH to give 1.8 g (35%) of the salt as white crystals, mp 250° C. dec.

Quelle