Pon de relay: A convenient and efficient synthesis of alkene‐functionalized furansfromcyclopropenes, which proceeds through an isomerization/olefination cascade sequence under copper–palladium relaycatalysis, has been developed (see scheme).
Pon de relay:已经开发了一种方便有效的方法,从环丙烯中合成烯烃官能化的呋喃,该过程在铜-钯中继催化下通过异构化/烯化级联序列进行(参见方案)。
Dual Gold/Silver Catalysis Involving Alkynylgold(III) Intermediates Formed by Oxidative Addition and Silver‐Catalyzed C−H Activation for the Direct Alkynylation of Cyclopropenes
作者:Yangyang Yang、Patrick Antoni、Marc Zimmer、Kohei Sekine、Florian F. Mulks、Long Hu、Lumin Zhang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201812577
日期:2019.4
While gold‐mediated synergistic catalytic processes involving transmetalations with other metals are well understood, AuI/AuIII cycles in these reactions are rarely reported. Herein a gold‐catalyzed direct alkynylation of cyclopropenes is enabled by two operating catalytic cycles, an oxidative catalytic cycle involving an alkynyl AuIII complex formed by oxidative addition and one involving a silver‐mediated
尽管众所周知金介导的与其他金属发生重金属化的协同催化过程,但很少报道这些反应中的Au I / Au III循环。在此,金的环丙烯丙烯直接烷基化反应通过两个操作催化循环实现,一个氧化催化循环涉及通过氧化加成形成的炔基Au III配合物,另一个涉及银介导的CH活化。
Dimerization of cyclopropenes to bifurans using tandem metal relay catalysis
An efficient synthesis of bifurans via dimerization of cyclopropenes has been successfully developed using a copper-promoted cycloisomerization and palladium-catalyzed dimerization cascade. These novel bifuran structures possess interesting optoelectronic properties.