Cu-Catalyzed one-pot synthesis of thiochromeno-quinolinone and thiochromeno-thioflavone <i>via</i> oxidative double hetero Michael addition using <i>in situ</i> generated nucleophiles
作者:Nallappan Sundaravelu、Govindasamy Sekar
DOI:10.1039/d0cc03210g
日期:——
catalyzed three-component synthesis of π-conjugated tetracyclic thiochromeno-quinolinone and thiochromeno-thioflavone was established via oxidative double hetero Michael additionusing in situ generated nucleophiles. Xanthate plays a dual role as an odourless sulfur source and a chemoselective reducing agent. The in situ formed iodine plays a crucial role in the oxidation step.
Cu-Catalyzed and iodine mediated synthesis of thioaurones <i>via in situ</i> C–S bond generation using xanthate as a sulfur surrogate
作者:Palanisamy Soundarya、Govindasamy Sekar
DOI:10.1039/d2ob01211a
日期:——
An efficient method for synthesizing thioaurones has been developed using xanthate as an odorless sulfur surrogate. This reaction's key success lies in the use of iodine as a reagent, which promotes the α-iodination followed by cyclization of saturated ketones. This methodology has also been demonstrated with less reactive 2′-bromochalcones in good yield. Synthesis of the red isomer of indigo, i.e