Air‐Stable Carbonyl(pentamethylcyclopentadienyl)cobalt Diiodide Complex as a Precursor for Cationic (Pentamethylcyclopentadienyl)cobalt(III) Catalysis: Application for Directed C‐2 Selective CH Amidation of Indoles
dienyl)cobalt diiodide complex [Cp*Co(CO)I2] was successfully utilized as the precursor of a cationic cobalt(III) active catalyst for directed CH bond functionalization. The complex Cp*Co(CO)I2 (2.5–1.25 mol%), in combination with silver hexafluoroantimonate (AgSbF6) and potassium acetate (KOAc), efficiently catalyzed the directed C‐2 selective amidation of indoles with sulfonyl azides, and the corresponding
A rhodium-catalyzed C–H functionalization with activated amides by decarbonylation has been developed. Notably, this is the first C–H arylation employing N-acylsaccharins as coupling partners to give biaryls in good to excellent yields. The highlight of the work is the high tolerance of functional groups such as formyl, ester, and vinyl and the use of a removable directing group.
Rhodium(iii)-catalyzed C2-selective carbenoid functionalization and subsequent C7-alkenylation of indoles
作者:Jingjing Shi、Yunnan Yan、Qiu Li、H. Eric Xu、Wei Yi
DOI:10.1039/c4cc01593b
日期:——
versatile method for efficient synthesis of a diverse range of 2-acetate substituted indoles via Rh(III)-catalyzed and alcohol-mediated C2-selective carbenoidinsertion functionalization of indoles by alpha-diazotized Meldrum'sacid has been developed. Furthermore, for the first time, a Rh(III)/Cu(II)-catalyzed direct C7-alkenylation of such functionalized products has also been demonstrated.
A direct C-2 methylation reaction of indoles bearing a readily removable N-2-pyrimidyl moiety as a site-specific directing group has been developed with a palladium catalyst. This reaction relied on the use of KF to promote efficient methylation. A moderate to good yield was achieved in a range of indole substrates.
Iridium(III)-Catalyzed Regioselective Carbenoid Insertion C-H Alkylation by α-Diazotized Meldrum's Acid
作者:Honggui Lv、William L. Xu、Kunhua Lin、Jingjing Shi、Wei Yi
DOI:10.1002/ejoc.201601212
日期:2016.12
straightforward protocol for IrIII-catalyzed regioselective carbenoid insertion C–H alkylationmediated by α-diazotized Meldrum's acid was developed. The assistance of external additives and oxidants was not needed, and the developed IrIII catalysis proceeds in a highly efficient manner (e.g., mild reaction conditions, short reaction times and excellent regioselectivity) and demonstrates good compatibility