[reaction: see text] A metalative 5-endo-dig cyclization reaction of 2-ynylphenoles or anilines effected by BuLi and ZnCl(2) produces 3-zinciobenzoheteroles in excellent yield. These intermediates have been transmetalated to the corresponding cuprates and allowed to react with electrophiles to produce a variety of 2,3-disubstituted benzofurans and indoles.
Iridium(<scp>i</scp>)-catalyzed hydration/esterification of 2-alkynylphenols and carboxylic acids
作者:Linwei Zeng、Renjie Chen、Chen Zhang、Hujun Xie、Sunliang Cui
DOI:10.1039/c9cc09984k
日期:——
An iridium(i)-catalyzed hydration/esterification of 2-alkynylphenols and carboxylicacids is described. Various 2-alkynylphenols and carboxylicacids could be used in this process to furnish aromatic ortho-acyloxyketones via a regio- and stereo-selective addition reaction followed by intramolecular rearrangement. This protocol features mild reaction conditions and broad substrate scope. Further transformations
A Facile Construction of Bisheterocyclic Methane Scaffolds through
<scp>Palladium‐Catalyzed</scp>
Domino Cyclization
作者:Hongbo Qi、Kaiming Han、Shufeng Chen
DOI:10.1002/cjoc.202100242
日期:2021.10
A convenient palladium-catalyzed domino cyclization reaction for the construction of bis(benzofuranyl)methanescaffolds bearing an all-carbon quaternary center has been described. In the cascade process, one C(sp2)—O bond, two C(sp2)—C(sp3) bonds as well as two benzofuran rings are formed in a single synthetic sequence. The approach shows wide scope of substrates and good functional-group tolerance
The efficient synthesis of morphologically different heteroacenes and the rapid determination of their solid-state and electronic properties are still challenging tasks, which slow down progress in the development of new materials. Here, we report a flexible and efficient synthesis of unprecedented heterotetracenes based on a platinum- and gold-catalyzed cyclization–alkynylation dominoprocess using
A novel and efficient palladium-catalyzed cascade annulation/arylthiolation reaction has been developed to afford functionalized 3-sulfenylbenzofuran and 3-sulfenylindole derivatives in moderate to good yields from readily available 2-alkynylphenols and 2-alkynylamines in ionic liquids. This protocol provides a valuable synthetic tool for the assembly of a wide range of 3-sulfenylbenzofuran and 3-sulfenylindole