Reaction of 2-aminobenzamides with indoline-2,3-dione in an ionic liquid in the presence and absence of iodine
The reaction of 2-aminobenzamides with indoline-2,3-dione in ionic liquids, selectively gives 1',3'-dihydrospiro[indolin-2-one-3,2'-quinazolin]-4'-ones in the presence of 5 mol% iodine, while giving 2-(1-acetyl-3-hydroxy-2-oxoindolin- 3-ylamino) benzamide