Palladium-Catalyzed [3 + 2] Annulation of Alkynes with Concomitant Aromatic Ring Expansion: A Concise Approach to (Pseudo)azulenes
作者:Fulin Zhou、Weiming Shi、Xingrong Liao、Yudong Yang、Zhi-Xiang Yu、Jingsong You
DOI:10.1021/acscatal.1c04549
日期:2022.1.7
in organic synthetic chemistry. Herein, we disclose a palladium-catalyzed [3 + 2] annulation technique of alkynes with concomitant aromatic ring expansion driven by a diboron reagent and iodide, affording a concise approach to azulenes (7-fused-5 bicycle) and pseudoazulenes (6-fused-5 bicycle). Compared with the documented synthetic strategies, the route to (pseudo)azulenes developed herein is applicable
Rhodium(III)‐Catalyzed Allylic C(sp
<sup>3</sup>
)–H Activation of Alkenyl Sulfonamides: Unexpected Formation of Azabicycles
作者:Alexis Archambeau、Tomislav Rovis
DOI:10.1002/anie.201504150
日期:2015.11.2
Unsaturated N‐sulfonamides undergo a RhIII‐ catalyzedallylicC(sp3)H activation followed by insertion with an exogenous internal alkyne. The reaction generates [3.3.0], [4.3.0], and [5.3.0] azabicyclic structures with excellent diastereoselectivity. Deuterium labeling experiments implicate a 1,3‐Rh shift as a key step in the mechanism.