Reaktion #6046

Reaktionsgleichung

[4R,5R]-4,5-bis(((1,1-dimethylethyl)-dimethylsilyl)oxymethyl)-1-oxaspiro[2,2]pentane

lithium iodide

→

title compound

[ 2R,3R]-2,3-Bis(((1,1-dimethylethyl)dimethylsilyl)oxymethyl)-cyclobutanone

Lösungsmittel

methylene chloride

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturhad been cooled in an ice bath
2. 2
   Sonstigethe ice bath was removed
3. 3
   workup.STIRRINGthe reaction mixture was stirred for 20 minutes at ambient temperature
4. 4
   WaschenThe reaction mixture was then washed with 5% aqueous sodium bicarbonate solution, 5% sodium bisulfite solution and brine
5. 5
   Trocknendried over anhydrous magnesium sulfate
6. 6
   Filtrationfiltered
7. 7
   Einengenconcentrated under reduced pressure

Vorschrift

A solution of 12.752 g (35.6 mmol) of [4R,5R]-4,5-bis(((1,1-dimethylethyl)-dimethylsilyl)oxymethyl)-1-oxaspiro[2,2]pentane, from Step D, in 50 mL of methylene chloride was added to a solution of 3.814 g (28.5 mmol) of lithium iodide in 200 mL of methylene chloride which had been cooled in an ice bath. After stirring the reaction mixture for 1 h at 0° C., the ice bath was removed and the reaction mixture was stirred for 20 minutes at ambient temperature. The reaction mixture was then washed with 5% aqueous sodium bicarbonate solution, 5% sodium bisulfite solution and brine, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to give 12.317 g (96.6% crude yield) of the title compound which was taken on to the next step without purifiaction; MS DCI-NH3M/Z: 376 (M+NH4)+.

Quelle