A convenient and efficient tandem cyclization/ sulfenylation of o-alkynyl-phenols/-anilines/enaminones for the synthesis of diverse sulfur-containing bisheterocycles has been developed using stable, odorless, and easy-to-handle elemental S 8 as a building block under green chemistry conditions. Notably, a one-step simple base-mediated organic transformation affords a benzofuran (indole or chromone) ring and two C−S bonds. Attractive features of this methodology include the absence of a metal catalyst, mild conditions, good functional group tolerance, and valuable product structures.
In this article, a convenient and efficient KIO3-promoted oxidative sulfenylation at the β-position of N‑heterocycles and subsequent aromatization in the presence of elemental S8 is presented. The reaction proceeds with...
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