The use of ionic liquid in catalysis is attracting more and more attention in the field of chemistry. In line with the research we have studied Supported Ionic Liquid Catalyst (SILC) which consist of benzimidazolium based ionic liquid immobilized on silica based solid support. The SILC proved to be an efficient heterogeneous catalyst for solvent less synthesis of 1-amidoalkyl naphthols from 2-naphthol, amides and aldehydes. The process represents a simple, ecologically safer, cost effective route to 1-amidoalkyl naphthol with high product quality, as well as easy product recovery and catalyst recycling. (C) 2011 Elsevier B.V. All rights reserved.