Table 2.

The compound 1a synthesized from ethanol solvent with different Cu(II) catalyst

Entry	Catalyst	Yield %
1	Copper (II)acetate	65
2	Copper (II) acetylacetonate	58
3	Dihydroxycopper	49
4	Copperhydroxide phosphate	68
5	Trifluoromethanesulfonate Copper(II)	52
6	Trifluoromethanesulfonate Copper(II)pyridine	61
7	Dichloro(1,10-phenanthroline)copper(II)	92
8	Copper(II)chloride	57
9	Copper(I) iodide	44

All reactions were carried out with 10 mol % of catalyst for 3 h in EtOH at r.t