Tertiary Enamide-Triggered S<sub>E</sub>Ar: Domino Allylation and Enamine-Type Addition
作者:Frédéric Beltran、Laurence Miesch
DOI:10.1021/acs.orglett.8b03987
日期:2019.3.15
ketospiro-enesulfonamides. By treatment with ZrCl4 and allylsilane, an intramolecular electrophilic aromatic substitution and subsequent allylation is observed. By treatment with TiCl4 and allylsilane, a double enamine-type reaction takes place, thus creating simultaneously four contiguous stereogenic centers diastereoselectively.
Au<sup>I</sup>-Catalyzed Hydroalkynylation of Haloalkynes
作者:Pedro D. García-Fernández、Javier Iglesias-Sigüenza、Paula S. Rivero-Jerez、Elena Díez、Enrique Gómez-Bengoa、Rosario Fernández、José M. Lassaletta
DOI:10.1021/jacs.0c07951
日期:2020.9.16
The AuI-catalyzed reaction between terminal alkynes and aromatic haloalkynes proceeds through divergent pathways depending on the nature of the catalyst counteranion. Thus, cationiccomplexes containing strongly basic NHC ligands and non-coordinating anions such as BArF4 catalyze the cis haloalkynylation of the terminal alkyne, whereas the introduction of a weakly basic triflate counteranion results
Visible-Light-Promoted Oxo-Sulfonylation of Ynamides with Sulfonic Acids
作者:Lu Wang、Chengrong Lu、Yanni Yue、Chao Feng
DOI:10.1021/acs.orglett.9b00733
日期:2019.5.17
A visible-light-promoted oxo-sulfonylation of ynamides with sulfonicacids is reported, giving rise to a collection of functionalized α-sulfonylated amides in a straightforward manner. The reaction proceeds sequentially through a cascade of electrophilic addition and photoinduced sulfonyl radical-sustained skeleton rearrangement. The high atom economy, mild reaction conditions, and wide substrate scope
Rhodium(III)-Catalyzed Atroposelective Synthesis of C–N Axially Chiral Naphthylamines and Variants via C–H Activation
作者:Peiyuan Wang、Yaling Huang、Jierui Jing、Fen Wang、Xingwei Li
DOI:10.1021/acs.orglett.2c00686
日期:2022.4.8
construction of two categories of C–N atropisomers via rhodium(III)-catalyzed C–Hactivation of sulfoxonium ylides en route to [4+2] annulation with sterically hindered, electron-rich alkynes. This reaction proceeds with high regio- and enantioselectivity under redox-neutral conditions via a double-substrate activation strategy, providing a novel entry to C–Naxiallychiral 4-functionalized 1-naphthols
Phosphine-catalyzed regio- and stereo-selective hydroboration of ynamides to (<i>Z</i>)-β-borylenamides
作者:Swetha Jos、Christine Tan、Pierre Thilmany、Alaâ Saadane、Carla Slebodnick、Gwilherm Evano、Webster L. Santos
DOI:10.1039/d2cc04543e
日期:——
We report a tri-n-butyl phosphine catalyzed regio- and stereo-selective hydroboration of ynamides to yield (Z)-β-borylenamides in good yields. Surprisingly, a formal cis addition to the triple bond was observed as confirmed by NMR and X-ray crystallography. 31P NMR studies suggest that a zwitterionic vinylphosphonium intermediate is key in the mechanism. The resulting products were further transformed