Synthesis of 2-amino-5-alkylidenethiazol-4-ones from ketones, rhodanine, and amines with the aid of re-usable heterogeneous silica-pyridine based catalyst
作者:Chhanda Mukhopadhyay、Suman Ray
DOI:10.1016/j.tet.2011.08.032
日期:2011.10
been developed towards the synthesis of novel 2-amino-5-alkylidenethiazol-4-ones from ketones, amines, and rhodanine. This is the first report of the use of ketones in contrast to aldehydes in all the earlier reported procedures. A new heterogeneous dipolar catalyst is designed and synthesized for this reaction. The unique properties of this catalyst facilitate the synthesis of such compounds. These
mercaptoacetic acid followed by acid-catalyzed cyclization, and by the reaction of ammonia or primary amines with carbon disulfide and chloroacetic acid in the presence of bases. The condensation of aromatic aldehydes or ketones at the nucleophilic C-5 active methylene of rhodanines has been performed using tetra(n-butyl)ammonium hydroxide, under microwave in the presence of tetra(n-butyl)ammoniumbromide, 1-