Efficient Synthesis of 1-Amidoalkyl-2-Naphthols by One-Pot, Three-Component Reaction under Solvent-Free Conditions

Table 2

Comparison of efficiency of various catalysts in the synthesis of 1-amidoalkyl-2-naphtholsa.

Conditions	Time (h)	Yield (%)	Reference
Ce(SO4)2, CH3CN, reflux	36	72	[9]
Fe(HSO4)3, 85^°C	20	56	[12]
K5CoW12O40·3H2O	2	90	[11]
I2, 125^°C	4.5	87	[10]
K-10 clay, 125^°C	1.5	89	[8]
Cl3CCOOH, 120^°C	3 min	85	This work

aTimes and yields refer to the reaction of benzaldehyde, 2-naphthol, and acetamide.