Acetic Acid → HCID 22175296, compound

Participants

Reaction Steps

A solution of tert-butyl[6-[amino(hydroxyimino)methyl]-4-butoxy-2-isobutyl-1-oxo-1,2-dihydro-3-isoquinolinyl]methylcarbamate (0.46 g, 1 mmol), acetic anhydride (0.14 ml, 1.5 mmol) and a catalytic amount of acetic acid in tetrahydrofuran (10 ml) was refluxed under heating for 10 h. The reaction mixture was poured into water and extracted with ethyl acetate. The extract was washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was crystallized from ethyl acetate-diisopropyl ether to give tert-butyl[4-butoxy-2-isobutyl-6-(5-methyl-1,2,4-oxadiazol-3-yl)-1-oxo-1,2-dihydro-3-isoquinolinyl]methylcarbamate (0.22 g, 45.8%) as crystals.

Provenance & Evidence