Reaktion #64807

Reaktionsgleichung

ammonia methanol

isobutylchloroformate

N-[(phenylmethoxy)carbonyl]-L-leucine

N-methyl -morpholine

→

N-[(Phenylmethoxy)carbonyl]-L-leucinamide

Lösungsmittel

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   Sonstigethe reaction was quenched with water
3. 3
   SonstigeThe layers were separated
4. 4
   Extraktionthe aqueous layer was extracted with methylene chloride (2×)
5. 5
   TrocknenThe combined organic extracts were dried (MgSO4)
6. 6
   Sonstigeevaporated
7. 7
   Sonstigeto give 2.82 g

Vorschrift

To a solution of N-[(phenylmethoxy)carbonyl]-L-leucine (3 g., 11.3 mmol.) in 60 mL of methylene chloride at -20° under argon was added N-methyl -morpholine (1.24 mL, 11.3 mmol.) followed by isobutylchloroformate (1.47 mL, 11.3 mmol.). The resulting suspension was stirred at -20° C. for 15 minutes at which time a solution of ammonia/methanol (about 5.6M, 20 mL, 113 mmol.) was added. After 30 minutes at -20° C., the reaction was quenched with water and warmed to room temperature. The layers were separated and the aqueous layer was extracted with methylene chloride (2×). The combined organic extracts were dried (MgSO4) and evaporated to give 2.82 g. of the title A compound.

Quelle