Chloroform → HCID 20337222, compound

Participants

Reaction Steps

To a solution of di-tert-butyl 3-bromo-trans-1-propenylphosphonate (17.1 g.) in dry N,N-dimethylformamide (55 ml.) was added potassium salt of ethyl N-ethoxycarbonyloxycarbamate (11.03 g.). The reaction mixture was stirred for 10 minutes under ice-cooling and for 1.5 hours at ambient temperature. The reaction mixture was poured into ice water (400 ml.) and then the resultant mixture was extracted three times with ethyl acetate (300 ml., 200 ml. and 100 ml.). The combined ethyl acetate layer was washed three times with water (100 ml.), dried over magnesium sulfate and then concentrated under reduced pressure to give an oily residue (20.23 g.). The residue was subjected to column chromatography on silica gel (200 g.) [developing solvent: a mixture of chloroform and ethyl acetate (4:1)]. The fractions containing the object compound were collected and concentrated under reduced pressure to give an oily di-tert-butyl 3-(N-ethoxycarbonyl-N-ethoxycarbonyloxyamino)-trans- 1-propenylphosphonate (8.84 g.).

Provenance & Evidence