One-Pot Synthesis of Spirocyclopenta[<i>a</i>]indene Derivatives via a Cascade Ring Expansion and Intramolecular Friedel–Crafts-Type Cyclization
作者:Quanzhe Li、Jiaxin Liu、Yin Wei、Min Shi
DOI:10.1021/acs.joc.9b03126
日期:2020.2.21
A one-pot efficient synthetic approach for the rapid construction of spirocyclopenta[a]indene derivatives has been developed via an iodine-initiated cascade ring expansion and intramolecular Friedel-Crafts-type cyclization from propargyl alcohol-tethered alkylidenecyclobutanes under mild conditions with broad substrate scope. This cascade process can be elegantly conducted on a gram scale. A plausible
Cu(<scp>i</scp>)-Catalyzed addition–cycloisomerization difunctionalization reaction of 1,3-enyne-alkylidenecyclopropanes (ACPs)
作者:Peng-Hua Li、Yin Wei、Min Shi
DOI:10.1039/d0ob01692f
日期:——
A copper(I)-catalyzed three-component addition–cycloisomerization difunctionalization reaction of 1,3-enyne-ACPs with Togni I reagent and TMSCN under mild reaction conditions has been developed, affording 3-trifluoroethylcyclopenta[b]naphthalene-4-carbonitrile derivatives. The reaction proceeded through a copper(I)-catalyzed 1,4-addition of conjugated 1,3-enynes via a radical relay process and aromatic
开发了铜(I)在温和的反应条件下,用Togni I试剂和TMSCN在1,3-烯炔-ACPs上催化铜的三组分加成-环异构化双官能化反应,得到3-三氟乙基环戊[ b ]萘-4-甲腈衍生物。通过铜进行反应(我)催化的1,4-加成共轭1,3-烯炔的通过自由基中继处理和丙二烯-ACP中间体的芳族环异构。
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
Cu(I)-Catalyzed Coupling and Cycloisomerization of Diazo Compounds with Terminal Yne-Alkylidenecyclopropanes: Synthesis of Functionalized Cyclopenta[<i>b</i>]naphthalene Derivatives
作者:Peng-Hua Li、Liu-Zhu Yu、Xiao-Yu Zhang、Min Shi
DOI:10.1021/acs.orglett.8b01812
日期:2018.8.3
cycloisomerization of diazo compounds with terminal yne-alkylidenecyclopropanes (ACPs) has been presented. This reaction starts from the formation of an allenic intermediate in the Cu(I)-catalyzed cross-coupling reaction of a diazo compound with terminalalkyne in yne-tethered ACP and then undergoes a domino cycloisomerization of a 6π-electrocyclization and cyclopropane ring-opening rearrangement to give functionalized
提出了Cu(I)催化重氮化合物与末端炔基-亚烷基亚环丙烷(ACP)的偶联和环异构化。该反应从在重氮系ACP的重氮化合物与末端炔烃的Cu(I)催化的交叉偶联反应中形成烯丙基中间体开始,然后经历6π电环化和环丙烷开环的多米诺环异构化在温和的条件下重排得到中等至极好的收率的官能化的环戊[ b ]萘衍生物。
The First Formation of (1<i>Z</i>)-1-Alkylidene-1<i>H</i>-isobenzofuranium Amides and 1<i>H</i>-Inden-1-ones: Acid-Promoted 5-<i>exo</i>Cyclization and Hydration/Aldol Condensation Reactions of<i>o</i>-Ethynylbenzophenones
作者:Noriyoshi Nagahora、Tatsuya Wasano、Kazuhiro Nozaki、Tamaki Ogawa、Shuhei Nishijima、Daiki Motomatsu、Kosei Shioji、Kentaro Okuma
DOI:10.1002/ejoc.201301599
日期:2014.3
ambient temperature resulted in acid-promotedhydration and sequential intramolecular aldolcondensationreactions to afford 3-aryl-1H-inden-1-one derivatives in good yields. The proposed reaction mechanism was strongly supported by the reaction behaviour of 4-chloro- and 5-methoxy-2-ethynylbenzophenone derivatives as substrates with Tf2NH, leading to the formation of the corresponding 3-aryl-1H-inden-1-ones