Trifluoroacetic acid → HCID 53647970, compound

Participants

Reaction Steps

A solution of 5.15 g. (29.4 mM) of DL N-allyloxycarbonyl-α-hydroxyglycine and 3.95 g. (29.4 mM) of benzo[b]thiophene in 40 ml. of trifluoroacetic acid was stirred at 22.5° C. for eighteen hours. The reaction mixture was then concentrated by evaporation under reduced pressure to give an oil, and the oil was dissolved in a mixture of 100 ml. of ethyl acetate and 100 ml. of water. The organic layer was separated, and the aqueous layer was extracted twice more with 50 ml. portions of fresh ethyl acetate. The organic extracts were combined, washed with water, and then extracted twice with 100 ml. portions of 10% aqueous sodium bicarbonate. The aqueous extracts were combined, added to 100 ml. of fresh ethyl acetate, and acidified to pH 2.0 by the addition of conc. hydrochloric acid. The organic layer was separated and the aqueous acid layer was extracted with two 50 ml. portions of fresh ethyl acetate. The organic portions were combined, dried, and the solvent was removed by evaporation to provide 7.55 g. (88% yield) of N-allyloxycarbonyl-(3-benzothienyl)glycine.

Provenance & Evidence