2-difunctionalized benzenes, the sites other than its formal triple bond remain silent in typical benzyne transformations. An unprecedented aryne 1,2,3,5-tetrasubstitution was realized from 3-silylbenzyne and aryl allyl sulfoxide, the mechanistic pathway of which includes a regioselective aryne insertion into the S═O bond, a [3,6]-sigmatropic rearrangement, and a thermal aromatic 1,3-silyl migration cascade.
Aryne Trifunctionalization Enabled by 3-Silylaryne as a 1,2-Benzdiyne Equivalent
作者:Chunjie Lv、Caiwen Wan、Song Liu、Yu Lan、Yang Li
DOI:10.1021/acs.orglett.8b00469
日期:2018.4.6
3-trifunctionalization protocol from 2,6-bis(silyl)aryl triflates was developed under transition-metal-free conditions. The reaction of generated 3-silylaryne with both pyridine N-oxide and N-hydroxylamide afforded o-silyl triflate/tosylate in a one-pot transformation, allowing the formation of 2,3-aryne precursors with various vicinal pyridinyl/amido substituents. These pyridinyl-substituted 2,3-aryne intermediates
Benzyne Polyfunctionalization via a Tandem C–C σ-Bond Insertion and Photo-Nazarov Cyclization
作者:Caiwen Wan、Yueyin Guo、Xiaocui Chen、Rongrong Gu、Jiarong Shi、Yang Li
DOI:10.1021/acs.orglett.2c02652
日期:2022.10.14
A tandem benzyne C–C σ-bond insertion reaction and photo-Nazarov cyclization protocol was developed, leading to the formation of three C–C bonds at consecutive positions of a benzene ring with concomitant assembly of a 6-5-6 tricyclic ring system. When 3-silylbenzyne precursors were employed, a tandem process involving a benzyne C–C σ-bond insertion, a photo-Nazarov cyclization, and a 1,3-silyl group
Synthesis of Biaryl Compounds through Three-Component Assembly: Ambidentate Effect of the<i>tert</i>-Butyldimethylsilyl Group for Regioselective Diels-Alder and Hiyama Coupling Reactions
作者:Shuji Akai、Takashi Ikawa、Sho-ichi Takayanagi、Yuki Morikawa、Shinya Mohri、Masaya Tsubakiyama、Masahiro Egi、Yasufumi Wada、Yasuyuki Kita