Triethylamine → HCID 57134535, compound

Participants

Reaction Steps

(S)-2-(tert-Butoxycarbonylamino)-1,2,3,4-tetrahydronaphthalen-7-yl trifluoromethanesulfonate (500 mg), ethyl acrylate (179 μl), triphenylphosphine (22 mg), palladium acetate (9.3 mg) and triethylamine (250 μl) were allowed to react for 6 hours at 90° C. and for 5 hours at 100° C. with stirring. Ethyl acrylate (97 μl), triethylamine (125 μl) and bis(triphenylphosphine)palladium(II) dichloride (27 mg) were added to the reaction mixture, followed by reaction for 11 hours at 100° C. with stirring. Water was added to the reaction mixture, and the resulting mixture was extracted with ethyl acetate. The extract was washed with 1 N hydrochloric acid and 0.5 M aqueous phosphate buffer solution (pH 7) sequentially, and dried over anhydrous magnesium sulfate, then the solvent was removed in vacuo. Purification by medium pressure liquid column chromatography on silica gel (eluent: dichloromethane/ethyl acetate=20/1) and sequential recrystallization from diisopropyl ether of the residue gave ethyl (S)-3-[2-(tert-butoxycarbonylamino)-1,2,3,4-tetrahydronaphthalen-7-yl]acrylate (252 mg) having a melting point of 99-100° C.

Provenance & Evidence