3-dimethoxybenzoic acid hydrazones 6b, f– h, j and imine 6a yielded 2-substituted 3-acetoxyisoindolinones (9i– n and 10e, respectively). Under similar conditions, the thiosemicarbazone 6i afforded the thiadiazoloisoindole derivative 11. The structures of the products were proved by spectroscopic evidence and through unambiguous syntheses via the corresponding 3-chloro- and 3-hydroxyisoindolinone derivatives (9a–
K-10 effectively catalyzed the condensation and substitution reactions. The approach was based on the direct cyclization of phthalaldehydicacid and opianic acid with substituted hydrazines. The reactions provided excellent yields and high selectivities in very short time (5-35 minutes). phthalazinones - phthalaldehydicacid - opianic acid - hydrazines - montmorillonite K-10 - microwave heating