C S and C N bond formation via Mn-promoted oxidative cascade reaction: Synthesis of C3-sulfenated indoles
作者:Lin He、Xianwei Li
DOI:10.1016/j.tet.2017.09.003
日期:2017.10
Thioethers are of synthetic value in pharmaceutical molecules and nature products, herein, we report an oxidative cascade reaction that delivers multiple substituted indole thioethers with great efficiency. This transformation utilized ortho-azido aromatic alkynes as the substrates, and sulfonyl hydrazides as the sulfenation reagent promoted by Mn(III) catalyst. Notably, great functional group tolerance
A novel method for the formation of indole derivatives via gold-catalyzed tandem reactions of 2-alkynyl arylazides and oxygen-containing heterocycles has been developed. A variety of indole derivatives were prepared under mild reaction conditions.
An efficient method for the synthesis of 1H-indole-3-sulfonates via Palladium-catalyzed tandemreactions of 2-alkynyl arylazides with sulfonic acids has been developed. The desired products were obtained in good to excellent yields under mild reaction conditions. The reactions were shown to proceed very fast, in most cases, within 10 min.
One-pot synthesis of 3-hydroxy-2-oxindoles <i>via</i> acyloin rearrangements of 2-hydroxy-indolin-3-ones generated <i>in situ</i> from 2-alkynyl arylazides
A novel one-pot method to prepare 3-hydroxy-2-oxindoles via acyloin rearrangements of 2-hydroxy-indolin-3-ones generated in situ from 2-alkynyl arylazides has been described. The reaction was accomplished to afford a variety of 3-hydroxy-2-oxindole derivatives in moderate to good yields under mild conditions.
Palladium-Catalyzed One-Pot Synthesis of C2-Quaternary Indolin-3-ones via 1<i>H</i>
-indole-3-sulfonates Generated in Situ from 2-Alkynyl Arylazides and Sulfonic Acids
A novel method for the synthesis of C2‐quaternary indole‐3‐ones via palladium‐catalyzedone‐pot transformation of 2‐alkynylarylazides is described. The reaction produced in moderate to excellent yields under mild conditions. This novel rearrangement of 1‐H‐indole‐3‐sulfonates represents an important contribution to the application of aryl sulfonates.