Reaktion #57497

Reaktionsgleichung

2-(3,5-Dichlorophenoxy)-N-(1-tert-butyldimethylsilyloxy-4-methylpent-2-yn-4-yl)butyramide

tetra n-butylammonium fluoride

hexane ethyl acetate

→

required product

2-(3,5-dichlorophenoxy)-N-(1-hydroxymethyl-4-methylpent-2-yn-4-yl) butyramide

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONOn completion of the addition
2. 2
   workup.WAITstored for 18 hours
3. 3
   SonstigeThe solvent was evaporated under reduced pressure
4. 4
   Sonstigethe residue partitioned between ethyl acetate and aqueous ammonium chloride
5. 5
   SonstigeThe organic phase was separated
6. 6
   Waschenwashed with aqueous ammonium chloride, brine
7. 7
   Trocknendried over magnesium sulphate
8. 8
   Sonstigeevaporated under reduced pressure
9. 9
   Sonstigeto give a colourless solid

Vorschrift

2-(3,5-Dichlorophenoxy)-N-(1-tert-butyldimethylsilyloxy-4-methylpent-2-yn-4-yl)butyramide (prepared as described in Example 1; 3.35 g) in tetrahydrofuran (60 ml) was stirred at 3-5° C. and a solution of tetra n-butylammonium fluoride (14.6 ml of 1M solution in tetrahydrofuran) was added dropwise over 5 minutes. On completion of the addition, the mixture was stirred for 0.5 hour at 0° C., 2 hours at ambient temperature and stored for 18 hours. The solvent was evaporated under reduced pressure and the residue partitioned between ethyl acetate and aqueous ammonium chloride. The organic phase was separated, washed with aqueous ammonium chloride, brine, dried over magnesium sulphate and evaporated under reduced pressure to give a colourless solid that was fractionated by chromatography (silica; hexane/ethyl acetate, 2:1 by volume) to give the required product as a colourless solid (2.01 g) mp 104-106° C.

Quelle