Aluminum phosphate [AlPO4(H)]: A mild and efficient recyclable catalyst for one-pot synthesis of polyhydroquinoline via the Hantzsch reaction under solvent-free conditions

Polyhydroquinolines have been synthesized in good to excellent yields (80–90%) and short reaction times (15–30 min) in the presence of aluminum phosphate [AlPO4] as heterogeneous catalyst at 90°C; the reaction workup is simple and the catalyst aluminum phosphate [AlPO4] can be easily separated from the product and reused. J. Heterocyclic Chem., (2012).