maybe theses references can help you:
Solvent- and chromatography-free amination of π-deficient nitrogen heterocycles under microwave irradiation. A fast, efficient and green route to 9-aminoacridines, 4-aminoquinolines and 4-aminoquinazolines and its application to the synthesis of the drugs amsacrine and bistacrine DOI:10.1016/j.tet.2012.11.083
One-pot synthesis of various xanthene derivatives using ionic liquid 1,3-disulfonic acid imidazolium hydrogen sulfate as an efficient and reusable catalyst under solvent-free conditions DOI:10.1016/j.cclet.2013.11.016
Organocatalyzed solvent free an efficient novel synthesis of 2,4,5-trisubstituted imidazoles for α-glucosidase inhibition to treat diabetes DOI:10.1016/j.bioorg.2014.11.006
Hitesh A. Barad
K.K.S.J. MANINAGAR SCIENCE COLLEGE
Universitas Mercu Buana
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