Reaktion #656546

Reaktionsgleichung

water

tert-butyl 2-benzyloxycarbonylmethoxyimino-3-oxobutyrate

boron trifluoride diethyl etherate

pyridinium hydrobromide

→

2-benzyloxycarbonylmethoxyimino-4-bromo-3-oxobutyric acid

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted twice with ethyl acetate (70 ml)
2. 2
   WaschenThe combined extracts were washed with 10% hydrochloric acid
3. 3
   Trocknenby drying over magnesium sulfate
4. 4
   SonstigeRemoval of the solvent

Vorschrift

To a solution of tert-butyl 2-benzyloxycarbonylmethoxyimino-3-oxobutyrate (2.0 g) in dry tetrahydrofuran (20 ml) were added boron trifluoride diethyl etherate (3.0 ml) and pyridinium hydrobromide perbromide (3.0 g) at ambient temperature, followed by stirring for 6 hours. The reaction mixture was poured into water (50 ml) and then extracted twice with ethyl acetate (70 ml). The combined extracts were washed with 10% hydrochloric acid and then a saturated aqueous sodium chloride, followed by drying over magnesium sulfate. Removal of the solvent gave 2-benzyloxycarbonylmethoxyimino-4-bromo-3-oxobutyric acid (2.0 g).

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