I can do it! Accelerated by simple iodide ions, rhodium‐catalysed transferhydrogenation can be readily performed on quinolines, isoquinolines and quinoxalines, affording the tetrahydro products in high yields with low catalyst loading (see scheme).
Indium metal as a reducing agent in organic synthesis
作者:Michael R. Pitts、Justin R. Harrison、Christopher J. Moody
DOI:10.1039/b101712h
日期:——
aromatic nitrocompounds under similar conditions results in selectivereduction of the nitro groups; ester, nitrile, amide and halide substituents are unaffected. Likewise indium in aqueous ethanolic ammonium chloride is an effective method for the deprotection of 4-nitrobenzyl ethers and esters. Indium is also an effective reducing agent under non-aqueous conditions and α-oximino carbonyl compounds can
An efficient catalytic method is presented for the hydrogenation of N‐heterocycles. The iridium‐based catalyst operates under mild conditions in water without any co‐catalyst or stoichiometric additives. The catalyst also promotes the reverse reaction of dehydrogenation of N‐heterocycles, hence displaying appropriate characteristics for a future hydrogen economy based on liquid organic hydrogen carriers
Synthesis of Tetrahydroquinolines via Borrowing Hydrogen Methodology Using a Manganese PN<sup>3</sup> Pincer Catalyst
作者:Natalie Hofmann、Leonard Homberg、Kai C. Hultzsch
DOI:10.1021/acs.orglett.0c02905
日期:2020.10.16
simple secondary alcohols is reported. This one-pot cascade reaction is based on the borrowinghydrogenmethodology promoted by a manganese(I) PN3 pincer complex. The reaction selectively leads to 1,2,3,4-tetrahydroquinolines thanks to a targeted choice of base. This strategy provides an atom-efficient pathway with water as the only byproduct. In addition, no further reducing agents are required.
作者:Yan Wang、Baobiao Dong、Zikun Wang、Xuefeng Cong、Xihe Bi
DOI:10.1021/acs.orglett.9b01055
日期:2019.5.17
A ligand- and base-free silver-catalyzed reduction of quinolines and electron-deficient aromatic N-heteroarenes in water has been described. Mechanistic studies revealed that the effective reducing species was Ag–H. This versatile catalytic protocol provided facile, environmentally friendly, and practical access to a variety of 1,2,3,4-tetrahydroquinoline derivatives at room temperature.