Reaktion #8631

Reaktionsgleichung

[1-(methoxymethylcarbamoyl)-2-naphthalen-2-ylethyl]carbamic acid tert-butyl ester

LAH

→

aldehyde

(1-formyl-2-naphthalen-2-ylethyl)carbamic acid tert-butyl ester

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling to −60° C.
2. 2
   Sonstigethe reaction is quenched by the addition of citric acid in methanol (1:1 by weight)
3. 3
   SonstigeDuring quenching the temperature
4. 4
   Temperaturis maintained at about −45° C
5. 5
   Temperaturto warm to room temperature
6. 6
   Sonstigepartitioned between EtOAc and water
7. 7
   Extraktionthe water phase extracted again with EtOAc
8. 8
   Waschenwashed with sat NaCl
9. 9
   Sonstigedried
10. 10
    Einengenconcentrated in vacuo

Vorschrift

To a solution of [1-(methoxymethylcarbamoyl)-2-naphthalen-2-ylethyl]carbamic acid tert-butyl ester, 67, (5.0 g, 13.4 mmol) in THF (40 mL) at −30° C. to −25° C. is added LAH (16.7 mL of a 1M solution in THF) over about 10 minutes and the reaction is then cooled to −55° C. and the stirring is continued for 3 hours. After cooling to −60° C., the reaction is quenched by the addition of citric acid in methanol (1:1 by weight). During quenching the temperature is maintained at about −45° C. The mixture is then allowed to warm to room temperature and partitioned between EtOAc and water and the water phase extracted again with EtOAc. The organic phases are combined and washed with sat NaCl, dried and concentrated in vacuo to afford the crude aldehyde as a white solid which is used without further purification.

Quelle