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A Silica-Supported Organocatalyst for the Preparation of Xanthenes
M. Nandi, J. Mondal, K. Sarkar, Y. Yamauchi, A. Bhaumik*
Indian Association for the Cultivation of Science, Jadavpur and Integrated Science Education and Research Centre, Visva-Bharati, India; National Institute for Materials Science, Tsukuba, Japan
19 August 2011 (online)
An acid-functionalized mesoporous silica (AFS-1) was prepared from a mesoporous silica (SBA-15), 3-aminopropyltriethoxysilane and 4-formylbenzoic acid. The reaction of aromatic aldehydes and 2-naphthol with AFS-1 gave the corresponding xanthenes in 75-82% yield (5 examples).