Reaktion #81085

Reaktionsgleichung

Potassium bromide

D-leucine

sodium nitrite

→

crude title product

Ausbeute 60.2%

(R)-2-Bromo-4-methylpentanoic acid

Ausbeute 60.2%

Lösungsmittel

sulfuric acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturmaintaining the temperature between -10° and -5° C
2. 2
   workup.ADDITIONAfter addition
3. 3
   Temperaturwarmed to room temperature
4. 4
   workup.STIRRINGstirred for another hour
5. 5
   ExtraktionThe reaction mixture was then extracted twice with ether
6. 6
   Waschenthe ether extracts were washed once with water
7. 7
   Trocknendried (magnesium sulfate)
8. 8
   Filtrationfiltered
9. 9
   Sonstigeevaporated

Vorschrift

Potassium bromide (9.5 g., 80 mmol) was added to a stirred solution of D-leucine (3.0 g., 23 mmol) in 2.5N sulfuric acid (47 ml) at room temperature. The reaction mixture was cooled to -10° C. and solid sodium nitrite (2.4 g., 34 mmol) was added portionwise, maintaining the temperature between -10° and -5° C. After addition was complete, the reaction was stirred for 1 hour and then warmed to room temperature and stirred for another hour. The reaction mixture was then extracted twice with ether, the ether extracts were washed once with water, dried (magnesium sulfate), filtered and evaporated to give 2.7 g of crude title product.

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