thionyl bromide is demonstrated in this work. Mild reaction conditions and broad scope of substrates ranging from heterocyclic structures to pharmaceutics-potential motifs are used in the reactions of this paper. Efficient bromination of ortho CH bonds of the aryhydroxylamines has been achieved. Ortho-bromoanilide products were obtained in good to excellent yields, and model scaled-up reactions of this
Direct Construction of
<scp>NOBINs</scp>
<i>via</i>
Domino Arylation and Sigmatropic Rearrangement Reactions
作者:Ji‐Wei Zhang、Liang‐Wen Qi、Shaoyu Li、Shao‐Hua Xiang、Bin Tan
DOI:10.1002/cjoc.202000358
日期:2020.12
Privileged 2‐amino‐2’‐hydroxy‐1,1’‐binaphthyl (NOBIN) frameworks were constructed through a novel domino arylation of naphthylhydroxylamines with diarylhalonium salts and sigmatropic rearrangement in a transition metal‐free fashion. This protocol bears broad substrate generality and proceeds under mild reaction conditions, affording diversified NOBINs in high efficiency with absolute regiocontrol during the
Copper-Catalyzed Tandem <i>O</i>-Vinylation of Arylhydroxylamines/[3,3]-Rearrangement/Cyclization: Synthesis of Highly Substituted Indoles and Benzoindoles
arylhydroxylamine using vinyliodonium salts as vinylation reagents to generate a transient O-vinyl-N-arylhydroxylamine that rapidly undergoes a [3,3]-sigmatropic rearrangement and subsequent cyclization/rearomatization to form a substituted indole. A wide range of highly substituted indoles and benzoindoles can be afforded in good yields. This approach is readily scalable, and the scope and application of this process
transition-metal free direct O-arylation of arylhydroxylamines employing diaryliodonium salts as arylation reagents to form transient N,O-diarylhydroxylamines that could subsequently undergo [3,3]-sigmatropic rearrangement and re-aromatization to afford structurally diverse NOBIN analogs in good to excellent yields under mild conditions.