Metal-Free One-Pot Synthesis of (Tetrahydro)Quinolines through Three-Component Assembly of Arenediazonium Salts, Nitriles, and Styrenes
作者:So Won Youn、Huen Ji Yoo、Eun Mi Lee、Seo Young Lee
DOI:10.1002/adsc.201701451
日期:2018.1.17
achieved through a three‐component assembly reaction of arenediazonium salts, nitriles, and styrenes. In sharp contrast to the prior works with the same reagent blend, the formation of N‐arylnitrilium intermediates from arenediazonium salts and nitriles was followed by reaction with styrenes, leading to 3,4‐dihydroquinolinium salts as a common intermediate. These could be further transformed to quinolines
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.
Visible-light-mediated organoboron-catalysed metal-free dehydrogenation of N-heterocycles using molecular oxygen
作者:Lanfeng Wei、Yu Wei、Jinli Zhang、Liang Xu
DOI:10.1039/d1gc01063h
日期:——
photocatalysts. On the other hand, oxygen is an ideal oxidant in terms of atom economy and environmental friendliness. However, the poor reactivity of oxygen at the ground state makes its utilization challenging. Herein, a visible-light-induced oxidativedehydrogenative process is disclosed, which uses an organoboron compound as the photocatalyst and molecularoxygen as the sole oxidant. Via this approach, an
been developed for the oxidant‐ and base‐free dehydrogenativecoupling of N‐heterocycles at mild conditions. Under the action of an iridium catalyst, N‐heterocycles undergo multiple sp3 CH activation steps, generating a nucleophilic enamine that reacts in situ with various electrophiles to give highly functionalized products. The dehydrogenativecoupling can be cascaded with Friedel–Crafts addition