Table 3.

Comparison of the polyhydroquinolines synthesis in presence of various catalysts.

Entry	Catalyst	Time (min)	Yield (%)a	Ref.
1	FeAl2O4	180	90	52
2	Fe3O4@D-NH-(CH2)4-SO3H	90	86	53
3	Fe3O4@FSM-16-SO3H	25	86	54
4	Fe3O4-TEDETA-Br3	120	92	55
5	Fe3O4@SiO2@(CH2)3Im}C(NO2)3	18	89	56
6	Fe3O4@SiO2–PEG/NH2	20	96	57
7	Fe3O4@GA@IG	45	89	41
8	AIL-SCMNPs	15	80	58
9	Zn-MOF	85	96	This work

^aIsolated yield.