Merger of Visible-Light Photoredox Catalysis and C–H Activation for the Room-Temperature C-2 Acylation of Indoles in Batch and Flow
作者:Upendra K. Sharma、Hannes P. L. Gemoets、Felix Schröder、Timothy Noël、Erik V. Van der Eycken
DOI:10.1021/acscatal.7b00840
日期:2017.6.2
and versatile protocol for the C–H acylation of indoles via dual photoredox/transition-metal catalysis was established in batch and flow. The C–H bond functionalization occurred selectively at the C-2 position of N-pyrimidylindoles. This room-temperature protocol tolerated a wide range of functional groups and allowed for the synthesis of a diverse set of acylated indoles. Various aromatic as well as
Direct C-2 acylation of indoles with toluene derivatives via Pd(<scp>ii</scp>)-catalyzed C–H activation
作者:Yaping Zhao、Upendra K. Sharma、Felix Schrӧder、Nandini Sharma、Gonghua Song、Erik V. Van der Eycken
DOI:10.1039/c7ra06004a
日期:——
A simple and efficient Pd-catalyzed method for the C2-acylation of indoles is described. Less toxic, stable, and commercially available toluene derivatives were used as acyl sources, with tert-butylhydroperoxide (TBHP) as oxidant and pivalic acid as additive, providing moderate to good yields.
Batting the ylides: A simple procedure carried out under mild conditions allows the direct and efficientsynthesis of structurally diverse indoles. This approach involves a cascadereaction of sulfurylides and N‐(ortho‐chloromethyl)arylamides (see scheme).
Selective Synthesis of Quinolines and Indoles: Sulfur-Assisted or Selenium-Catalyzed Reaction of β-(2-Nitrophenyl)-α,β-unsaturated Ketones with Carbon Monoxide
A simple and selective synthetic method of quinolines and indoles by the reaction of β-(2-nitrophenyl)-α,β-unsaturatedketones with carbonmonoxide was developed. When β-(2-nitrophenyl)-α,β-unsaturatedketones were allowed to react with carbonmonoxide and water in the presence of a stoichiometric amount of sulfur or a catalytic amount of selenium, the corresponding quinolines were produced in moderate-to-good
Carbon dioxide: A reagent for the protection of nucleophilic centres and the simultaneous activation of alternative locations to electrophilic attack.
作者:Alan R. Katritzky、Kunihiko Akutagawa
DOI:10.1016/s0040-4039(00)98265-0
日期:1985.1
derivatives by using carbondioxide both for N-protection and to give an intermediate carbanion stabilizing group. t-Butyllithium was used as a lithiating agent at the alpha-carbon atom of the indole enamino group. The resulting 2-substituted indole-1-carboxylic acids underwent smooth thermal decarboxylation under mild conditions. Alternatively, with longer reaction times the protecting group is lost during