Hydrochloric Acid → (R)-6-cyano-N,N-diethyl-5-hydroxy-3-oxohexanamide

To a stirred -10° C. solution of N,N-diethylacetamide (prepared from N,N-diethylamine and acetyl chloride by refluxing for 2 hours in toluene) (28.75 g, 0.25 mol ) in tetrahydrofuran (0.25 L) is slowly added a solution of lithium diisopropylamide in tetrahydrofuran-heptane (0.125 L of 2M) while maintaining the temperature between -10° C. to -5° C., and the mixture is stirred at -20° C. to 0° C. for 30 minutes. (R)-4-cyano-3-hydroxybutyric acid, ethyl ester (Brower, supra) (10 g, 0.06 mol) as a solution in 200 mL of tetrahydrofuran is added to the previously prepared mixture. The reaction mixture is stirred for 30 minutes at -5° C. to -20° C., and transferred to a 2.2N aqueous hydrochloric acid solution (0.25 L). The aqueous layer is extracted with 300 mL of ethyl acetate, the aqueous layer is separated and reextracted with 50 mL of ethyl acetate, the extracts are combined and concentrated in vacuo to afford crude (R)-6-cyano-N,N-diethyl-5-hydroxy-3-oxohexanamide as an oil;

1. temperaturewhile maintaining the temperature between -10° C. to -5° C.
2. stirringThe reaction mixture is stirred for 30 minutes at -5° C. to -20° C.
3. extractionThe aqueous layer is extracted with 300 mL of ethyl acetate
4. customthe aqueous layer is separated
5. concentrationconcentrated in vacuo

ORDレコード

ord-6e00b7a8ace444058e856491f33d5fef

出典データセット

uspto-grants-1995_11

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US05470981