Transition metal-free tunable synthesis of 3-(trifluoromethylthio) and 3-trifluoromethylsulfinyl chromones via domino C H functionalization and chromone annulation of enaminones
The new reactions between -hydroxyphenyl enaminones and Langlois reagent (CFSONa) for the tunable synthesis of 3-(trifluoromethylthio) chromones and 3-trifluoromethylsulfinyl chromones are reported herein. Both type of reactions proceed under transition metal-free conditions. In addition, the conditions for the synthesis of 3-trifluoromethylsulfinyl chromones have also been found to be applicable for
A novel and highly regioselective ammonium iodide-induced nonradical sulfenylation method for the construction of a C-S bond was developed via C-H functionalization. With DMSO or (RSO2NHNH2)-S-1 as a sulfenylating agent, MeS- and (RS)-S-1-substituted flavone derivatives were obtained in good yields. This method enriches current C-S bond formation chemistry, making it a highly valuable and practical method in pharmaceutical industry.
LOWE, WERNER;KENNEMANN, ANGELA, ARCH. PHARM., 321,(1988) N 9, C. 541-543