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

Table 2

Effect of amount of catalyst on the synthesis of N-substituted Decahydroacridine-1,8-diones^a.

Entry	Catalyst (mol%)	Time (h)	Yield (%)^b
1	5	3.5	90
2	10	1.5	90
3	15	1.5	90

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