phosphoranyl radical chemistry allows for precise cleavage of a stronger C-O bond and formation of a weaker C-Cbond by 1,5-aryl migration under mild reaction conditions. This new protocol is independent of substrate redox-potential, electronic, and substituent effects. It affords a general and promising access to 60 examples of synthetically versatile o-amino and o-hydroxy diaryl ketones under redox-neutral
Synthesis of Diiodinated All-Carbon 3,3′-Diphenyl-1,1′-spirobiindene Derivatives via Cascade Enyne Cyclization and Electrophilic Aromatic Substitution
作者:Quanzhe Li、Liuzhu Yu、Yin Wei、Min Shi
DOI:10.1021/acs.joc.9b01418
日期:2019.7.19
from the reaction of propargyl alcohol-tethered alkylidenecyclopropanes with iodine. The reaction proceeded through an iodination-initiated cascade intramolecular enyne cyclization and electrophilic aromatic substitution reaction process in 1,2-dichloroethane upon heating, giving desired spirocyclic products in moderate to excellent yields. Further transformation of the obtained products has also been
Visible-light-mediated intramolecular radical cyclization of α-brominated amide-tethered alkylidenecyclopropanes
作者:Ben Mao、Xiao-Yu Zhang、Yin Wei、Min Shi
DOI:10.1039/d1cc07136j
日期:——
A ring-opening/cyclization cascade reaction of α-brominated amide-tethered alkylidenecyclopropanes in the presence of photocatalyst 4CzIPN under visible-light irradiation was developed to afford polycyclic benzazepine derivatives in good yields with broad substrate scope and good functional tolerance. A plausible mechanism involving a halogen atom transfer (XAT) process and a radical chain process is
Palladium‐Catalyzed Cascade Reductive and Carbonylative Cyclization of
<i>Ortho</i>
‐Iodo‐Tethered Methylenecyclopropanes (MCPs) Using
<i>N</i>
‐Formylsaccharin as CO Source
作者:Xing Fan、Min Shi、Yin Wei
DOI:10.1002/adsc.201901005
日期:2019.12.17
A palladium‐catalyzedreductive and carbonylative cyclization of ortho‐iodo‐tethered methylenecyclopropanes (MCPs) using N‐formylsaccharin as COsource has been developed, affording the desired indanone derivatives in moderate to good yields with high regio‐ and stereoselectivity and good functional group compatibility.