Palladium-catalyzed alkene-directed cross-coupling of aryliodide with another aryl halide through C-H arylation opens a unique avenue for unsymmetrical biaryl-derived molecules. However, homo-coupling of aryliodides often erodes the overall synthetic efficiency. Reported herein is a highly chemoselective Pd0 -catalyzed alkyne-directed cross-coupling of aryliodides with bromophenols, which was subsequently
Selective C(sp
<sup>3</sup>
)−N Bond Cleavage of
<i>N</i>
,
<i>N</i>
‐Dialkyl Tertiary Amines with the Loss of a Large Alkyl Group via an S
<sub>N</sub>
1 Pathway
alkyne-tethered aryl iodides with tertiary hydroxylamines has been developed for the rapid assembly of 3,4-fused tricyclic indoles with a removable aliphatic N-substituent. This domino reaction was realized by alkyne-directed palladacycle formation, electrophilic amination with tertiary hydroxylamines and selective C(sp3)−N bond cleavage with the loss of the larger alkyl group via an SN1 path.
已经开发了一种新型 Pd 0催化的 [2+2+1] 炔烃连接芳基碘化物与叔羟胺的环化反应,用于快速组装具有可去除脂肪族N取代基的 3,4-稠合三环吲哚。这种多米诺骨牌反应是通过炔烃定向的钯环形成、叔羟胺的亲电胺化和选择性 C(sp 3 )-N 键断裂以及通过 S N 1 路径损失更大的烷基来实现的。
Palladium-Catalyzed [2 + 2 + 1] Annulation of Alkyne-Tethered Aryl Iodides with Diaziridinone: Synthesis of 3,4-Fused Tricyclic Indoles
A novel palladium-catalyzed [2 + 2 + 1] annulation of alkyne-tethered aryl iodides with diaziridinone was developed, leading to the formation of 3,4-fused tricyclic indoles. From a mechanistic standpoint, the formation of fused tricyclic indole scaffolds involved C,C-palladacycles, which were synthesized through the intramolecular reaction of aryl halides and alkynes. The cascade reaction described
Herein, a concise and robust approach for the highly efficient assembly of [60]fullerene-fused tricyclic scaffolds has been developed through a palladium-catalyzed cascade [2 + 2 + 2] annulation process. Diverse tricyclic scaffolds incorporating various ring sizes (6–19 membered) and types (carbocycles and N- and O-heterocycles) can be expediently constructed in a single-step transformation.