Transition-metal-free sulfonylations of methylthiolated alkynones to synthesize 3-sulfonylated thioflavones
2020
A set of transition-metal-free NaI/TBHP-mediated sulfonylation cyclization reactions of methylthiolated alkynones with sulfonyl hydrazides was developed, by which various 3-sulfonylated thioflavones were prepared under mild reaction conditions. The features of this procedure included metal-free reaction conditions, ease of reagent handling, short reaction times, and a broad functional group tolerance.
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