Expanding the Scope of the Gold(I)-Catalyzed Rautenstrauch Rearrangement: Protic Additives
作者:Cédric Bürki、Andrew Whyte、Sebastian Arndt、A. Stephen K. Hashmi、Mark Lautens
DOI:10.1021/acs.orglett.6b02505
日期:2016.10.7
The synthesis of substituted 2-cyclopentenones using a commercially available gold(I) catalyst is described under flexible reaction conditions. During the course of our investigations, we discovered that using a proton source as an additive is required to obtain the desired substituted cyclopentenones in good yields.
Ruthenium-Catalyzed Cascade Annulation of Indole with Propargyl Alcohols
作者:Julia Kaufmann、Elisabeth Jäckel、Edgar Haak
DOI:10.1002/anie.201801846
日期:2018.5.14
Cascade transformations forming multiple bonds and one‐pot procedures provide rapid access to natural‐product‐like scaffolds from simple precursors. These atom‐economic processes are valuable tools in organic synthesis and drug discovery. Herein, we report on ruthenium‐catalyzed cascade annulations of indole with readily available propargylalcohols. These provide rapid access to diverse carbazoles
形成多个键和一锅法的级联转化提供了从简单前体中快速获得天然产物样支架的途径。这些原子经济过程是有机合成和药物发现中的宝贵工具。本文中,我们报道了钌与容易获得的炔丙醇的级联环空反应。这些提供了快速接近各种咔唑,环庚[ b ]吲哚和其他具有高选择性的稠合多环的途径。具有氧化还原偶联的环戊二烯酮配体的双功能钌配合物可作为不同级联过程的常用催化剂。
Ruthenium-catalyzed formation of pyrazoles or 3-hydroxynitriles from propargyl alcohols and hydrazines
作者:Julia Kaufmann、Elisabeth Jäckel、Edgar Haak
DOI:10.24820/ark.5550190.p010.893
日期:——
Functionalized pyrazoles are generated from secondary propragyl alcohols and hydrazines in a rutheniumcatalyzed cascade process, consisting of redox isomerization, Michael addition, cyclocondensation and dehydrogenation steps. The same bifunctional catalyst mediates the conversion of tertiary propargyl alcohols with hydrazine to 3-hydroxynitriles via anti-Markovnikov hydroamination followed by elimination