Benzyne 1,2,4-Trisubstitution and Dearomative 1,2,4-Trifunctionalization
作者:Jiarong Shi、Lianggui Li、Chunhui Shan、Zhonghong Chen、Liang Dai、Min Tan、Yu Lan、Yang Li
DOI:10.1021/jacs.1c04389
日期:2021.7.21
4-trifunctionalization of benzyne have been accomplished from sulfoxides bearing a penta-2,4-dien-1-yl moiety. These cascade transformations proceed through a benzyne insertion into the S═O bond and an uncommon regiospecific anionic [4,5]-sigmatropic rearrangement, furnishing a C–O, C–S, and C–C bond on the C1-, C2-, and C4-position of a benzene ring, respectively. This study showcases new cascade benzyne reaction
<i>N</i>-Arylation of Tertiary Amines under Mild Conditions
作者:Maayan Hirsch、Shubhendu Dhara、Charles E. Diesendruck
DOI:10.1021/acs.orglett.6b00078
日期:2016.3.4
for the N-arylation of tertiaryamines to sp3 quaternary ammonium salts is described. The presented conditions allow for the isolation of trialkylaryl, dialkyldiaryl, and novel triarylalkyl ammonium salts, including N-chiral quaternary ammonium salts. The reaction works at room temperature, open to air with electron-rich or -poor benzyne precursors and different tertiaryamines, allowing the synthesis
remarkable feature of new precursors is the selective generation of 3-haloarynes by suppressing the competitive thia-Fries rearrangement, which is the problem in the reaction using the well-known 3-haloaryne precursors. The advantage of new precursor 2a over a typical precursor 1 was confirmed by the direct comparisons in several reactions. The application of precursors 2a–2h to the syntheses of heterocycles
Copper-catalyzed arylstannylation of arynes in a sequence
作者:Hideya Tanaka、Hitoshi Kuriki、Teruhiko Kubo、Itaru Osaka、Hiroto Yoshida
DOI:10.1039/c9cc02738f
日期:——
Copper-catalyzed arylstannylation of arynes has been developed. This transformation enables variously substituted ortho-stannylbiaryls and teraryls to be constructed straightforwardly. An electron-deficient tin center is the key, and thus the single or dual insertion of arynes into arylstannanes is precisely controllable by simply changing the equivalence of aryne precursors.
Tandem α-Arylation/Cyclization of 4-Haloacetoacetates with Arynes: A Metal-Free Approach toward 4-Aryl-3-(2<i>H</i>)-furanones
作者:Jubi John、Vishnu K. Omanakuttan、Aneeja T.、Cherumuttathu H. Suresh、Peter G. Jones、Henning Hopf
DOI:10.1021/acs.joc.9b00488
日期:2019.5.3
developed for the synthesis of 4-aryl-3-(2H)-furanones. The reaction proceeds via the nucleophilic addition of an activemethylenecompound to the aryne followed by ring closing of the adduct. The reaction proceeds under mild conditions, is applicable for gram-scale synthesis of 4-aryl-3-(2H)-furanones, and is general for a range of substituted arynes and haloacetates.