Reaktion #951217

Reaktionsgleichung

sodium azide

methanesulfonyl chloride

(R)-1-(4,4,7-trimethyl-1,4-dihydro-indeno[2,1-c]-pyrazol-1-yl)-propan-2-ol

triethylamine

sodium chloride

→

(S)-1-(2-azido-propyl)-4,4,7-trimethyl-1,4-dihydro-indeno[2,1-c]pyrazole

Ausbeute 80.3%

Lösungsmittel

dichloromethane

dimethylformamide

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe mixture was stirred at this temperature for a further 1.5 hours
2. 2
   Waschenwashed twice with 70 ml of saturated sodium hydrogen carbonate solution each time
3. 3
   Extraktionthe combined aqueous phases were extracted once with 70 ml of dichloromethane
4. 4
   WaschenThe combined organic phases were washed with 70 ml of saturated sodium chloride solution
5. 5
   Trocknendried over magnesium sulfate
6. 6
   Sonstigeevaporated in a vacuum
7. 7
   SonstigeThe yellow oil obtained
8. 8
   Temperaturthe reaction mixture was heated to 70° for 15 hours
9. 9
   workup.STIRRINGwhile stirring
10. 10
    TemperaturAfter cooling
11. 11
    Extraktionextracted twice with 100 ml of diethyl ether each time
12. 12
    WaschenThe combined organic phases were washed once with 100 ml of water and once with 100 ml of saturated sodium chloride solution
13. 13
    Trocknendried over magnesium sulfate
14. 14
    Einengenthe solution was concentrated in a vacuum
15. 15
    SonstigeThe brown oil obtained
16. 16
    Sonstigewas purified by column chromatography on silica gel (ethyl acetate/toluene 1:1)

Vorschrift

0.5 ml (6.24 mmol) of methanesulfonyl chloride was added dropwise while stirring to a solution, cooled to 0°, of 0.8 g (3.1 mmol) of (R)-1-(4,4,7-trimethyl-1,4-dihydro-indeno[2,1-c]-pyrazol-1-yl)-propan-2-ol and 1.75 ml (12.5 mmol) of triethylamine in 50 ml of dichloromethane and the mixture was stirred at this temperature for a further 1.5 hours. The reaction mixture was subsequently diluted with 150 ml of dichloromethane, washed twice with 70 ml of saturated sodium hydrogen carbonate solution each time and the combined aqueous phases were extracted once with 70 ml of dichloromethane. The combined organic phases were washed with 70 ml of saturated sodium chloride solution, dried over magnesium sulfate and evaporated in a vacuum. The yellow oil obtained was dissolved in 40 ml of anhydrous dimethylformamide, treated with 0.41 g (6.3 mmol) of sodium azide and the reaction mixture was heated to 70° for 15 hours while stirring. After cooling, the solution was poured into 100 ml of semi-saturated sodium chloride solution and extracted twice with 100 ml of diethyl ether each time. The combined organic phases were washed once with 100 ml of water and once with 100 ml of saturated sodium chloride solution, dried over magnesium sulfate and the solution was concentrated in a vacuum. The brown oil obtained was purified by column chromatography on silica gel (ethyl acetate/toluene 1:1). 0.7 g (80%) of (S)-1-(2-azido-propyl)-4,4,7-trimethyl-1,4-dihydro-indeno[2,1-c]pyrazole was obtained as a light yellow oil.

Quelle