functionalized diheteroaryl and diaryl ketones was developed using Ru-catalysts of minimal stereogenicity. Various ketone substrates with structurally and electronically similar groups attached to the prochiral centers were reduced successfully in good to excellent enantioselectivities and yields. This protocol provides practical and efficient access to chiral diheteroarylmethanols and benzhydrols,
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。
Ag(I)‐Catalyzed/Acid‐Mediated Cascade Cyclization of
<i>ortho</i>
‐Alkynylaryl‐1,3‐dicarbonyls to Access Arylnaphthalenelactones and Furanonaphthol Libraries via Aryl‐Disengagement
ortho-Alkynylaryl-1,3-dicarbonyl derivatives were utilized for the synthesis of arylnaphthalenelactone via cascadecyclization/decarboxylation in one-pot. These classes of compounds showed good potency in inhibiting protein-tyrosine phosphatase 1B (PTP1B) enzyme.
New synthetic approaches for the synthesis of indoloquinolines and carbocycle-fused quinolines have been developed employing alkynylketone substrates. These synthetic transformations involved the application of N2-extrusion of azido complexes as a key step to generate carbodiimidium ion and nitriliumion in situ, which further cyclized intramolecularly with alkyne via a domino process to provide indoloquinolines
divergent synthesis of 3-hydroxyfluorene and 4-azafluorene derivatives has been developed. ortho-Alkynylarylketone was employed as the substrates to react with molecular iodine leading to the generation of a common intermediate, indenone precursor. This precursor could lead to the diversified products when the reaction was carried out under different conditions. The indenone intermediate was converted