Acetic Anhydride → Benafentrine

Participants

Reaction Steps

1.0 g of cis-6-(4-aminophenyl)-1,2,3,4,4a,10b-hexahydro-8,9-dimethoxy-2-methyl-benzo[c][1,6]naphthyridine (produced as in Example 5) is heated to 60° in a mixture of 2 cc of pyridine and 2 cc of acetic anhydride for 2 hours. The reaction mixture is then evaporated to dryness in a vacuum and the residue is crystallized from acetone. M.P. 173°-175°.

Provenance & Evidence