Efficient and Convenient Synthesis of 1,8-Dioxodecahydroacridine Derivatives Using Cu-Doped ZnO Nanocrystalline Powder as a Catalyst under Solvent-Free Conditions

Table 1

Optimization of the reaction conditions^a.

Entry	Solvent	Time (h)	Yield (%)^b
1	Ethanol	6	30
2	H2O	5	30
3	CH2Cl2	4	20
4	DMF	6	40
5	—	1.5	90

aReactions were carried out with dimedone, aniline, and benzaldehyde in 2 : 1 : 1 molar ratio.
^bYields refer to isolated pure products.