Acetic Acid → 2-((1R,3R,4S)-1-methyl-4-isopropylcyclohex-3-yloxy)propionitrile

1 g of a sodium hydride suspension (50% strength) in paraffin oil was added at a temperature of 0° C. to a solution of 30 g of L-menthol in 300 ml of dichloromethane. A solution of 12.5 ml acrylonitrile in 50 ml dichloromethane was slowly added dropwise, and the reaction mixture was then stirred at room temperature for a further 5 hours. The reaction mixture was worked up by cautiously adding 10 ml of glacial acetic acid, followed by 200 ml of water, and then extracting the mixture with dichloromethane. The dichloromethane extract was dried over sodium sulfate, filtered and concentrated. After chromatographic purification of the residue on silica gel using n-hexane/dichloromethane as the eluent, 25.03 g of crude 2-((1R,3R,4S)-1-methyl-4-isopropylcyclohex-3-yloxy)propionitrile were obtained and used for the next reaction step without further purification.

1. extractionextracting the mixture with dichloromethane
2. extractionThe dichloromethane extract
3. dry with materialwas dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customAfter chromatographic purification of the residue on silica gel

ORD-Eintrag

ord-339e1ff250f641c3b64602c0196a7803

Quelldatensatz

uspto-grants-1993_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05212173