Ionic liquid confined zeolite system: an approach towards water mediated room temperature synthesis of spiro[pyrazolo[3,4-e]benzothiazepines]

Abstract

A novel ionic liquid confined ZSM-5 zeolite catalyst system has been developed using different ionic liquids confined within a mesoporous ZSM-5 zeolite; their catalytic activity has been tested in aqueous media at room temperature for the greener synthesis of spiro[pyrazolo[3,4-e]benzothiazepine] analogues in higher yield with shorter reaction time for the first time. Recyclability of the novel catalyst system was also studied which resulted in no loss of their catalytic activity in up to five cycles making the whole system industrially viable.