Electrophilic Cyclization and Intermolecular Acetalation of 2-(4-Hydroxybut-1-yn-1-yl)benzaldehydes: Synthesis of Diiodinated Diepoxydibenzo[<i>c</i>,<i>k</i>][1,9]dioxacyclohexadecines
strategy for the preparation of diiodinated diepoxydibenzo[c,k][1,9]dioxacyclohexadecines from readily available 2-(4-hydroxybut-1-yn-1-yl)benzaldehydes through electrophile-triggered tandem cyclization/intermolecular acetalation sequence has been presented. The electrophilic macrocyclization can be performed under mild conditions and in up to gram quantities. Moreover, palladium-catalyzed coupling and
Synthesis of dihydropyrroles from <i>in situ</i>-generated zwitterions <i>via</i> Rh<sub>2</sub>(adc)<sub>4</sub>/TBAI dual catalysis
作者:Huaping Xu、Xiaoyu Kong、Mengjie Cen、Ze-Feng Xu、Shengguo Duan、Chuan-Ying Li
DOI:10.1039/d2cc04674a
日期:——
Triggered by formation of α-imino carbene, the regioselective synthesis of dihydropyrroles was achieved via a cascade 1,3-sulfinate migration/annulation. The sulfinate group was converted into sulfone during the group migration, and a stable anion bearing two electron-withdrawinggroups was thus formed. The addition of a catalytic amount of iodide is believed to assist the cleavage of the C–O bond
1,3‐Sulfinate Migration Triggered by α‐Imino Carbene and Divergent Zwitterion Cyclization: Synthesis of Cyclopropane, Dihydropyrrole, and Azepane Ring Systems
作者:Huaping Xu、Xiaoyu Kong、Mengjie Cen、Ze‐Feng Xu、Shengguo Duan、Chuan‐Ying Li
DOI:10.1002/ejoc.202201417
日期:2023.2.17
Three birds with one stone: A convenient divergent synthetic strategy was established by regulation on the intramolecular annulation modes of zwitterion bearing multiple reactive sites, yielding various functionalized 3-, 5-, and 7-membered rings.