H3PW12O40/[Bmim][PF6]-catalyzed multicomponent synthesis of novel 1-amino- and 1-amidoalkyl-2-naphthol derivatives

Multicomponent Reactions (MCRs) are a fundamental tool in modern synthetic methodology, which are used to combine simultaneously three or more reactants in a single reaction vessel to form a new product.1 MCRs have been widely used for the synthesis of amino- and amidoalkyl naphthols.2 Triarylmethanes (TRAMs) have been used as dyes, protecting groups, photochromic agents, optical active devices, and therapeutic agents.3 Although they can be prepared successfully using several methods, less attention has been paid to develop their synthetic applications until now.4 In continuation of our research on TRAMs,5 herein we wish to report the synthesis of novel 1-amino- and 1-amidoalkyl-2-naphthol derivatives employing a one-pot three-component condensation reaction of β-naphthol, formylated-triarylmethanes, and amine or amides in the presence of H3PW12O40/[Bmim][PF6] as Catalyst. The structures of the synthesized compounds were characterized by elemental analyses, and FT-IR, 1H-NMR, and 13C-NMR spectral data.

Keywords:

Triarylmethanes , Naphthol derivatives , Multicomponent reactions , H3PW12O40 , [Bmim][PF6].