Reaktion #352529

Reaktionsgleichung

para-toluenesulphonic acid

compound

5-Bromo-6,6-dimethoxy-4-hydroxy-4-(1-methylpropen-1-yl)-1-oxa-spiro[2.5]octane

→

expected product

Ausbeute 81.3%

5-Bromo-4-hydroxy-4-(1-methylpropen-1-yl)-1-oxa-spiro[2.5]octan-6-one

Ausbeute 81.3%

Lösungsmittel

acetone water

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeWhen the reaction
2. 2
   Sonstigethe acetone is evaporated off
3. 3
   ExtraktionThe aqueous phase remaining is then extracted with ethyl acetate (200 ml)

Vorschrift

1.9 g (9.96 mmol) of para-toluenesulphonic acid are added at room temperature to a solution of 3.2 g (9.96 mmol) of the compound obtained in Step B in 120 ml of an acetone/water mixture (3:2). When the reaction, followed by thin-layer chromatrography, is complete, the acetone is evaporated off. The aqueous phase remaining is then extracted with ethyl acetate (200 ml). After conventional treatment of the organic phase, 2.23 g (8.1 mmol) of the expected product are obtained.

Quelle