silver‐catalyzed chemoselective [4+2] annulation of aryl and heteroaryl isocyanides with α‐substituted isocyanoacetamides was developed for the facile and efficient synthesis of 2‐aminoquinolones, naphthyridines, and phenanthrolines. A mechanism for this multistep domino reaction is proposed on the basis of a 13C‐labeling experiment, according to which an unprecedented chemoselective heterodimerization
Palladacycle‐phosphine catalyzed chemoselectivealkylation of aminoacetophenones was achieved by using an environmentally friendly hydrogen auto transfer strategy.
Metal‐Free Synthesis of Anthranils by PhIO Mediated Heterocyclization of
<i>ortho</i>
‐Carbonyl Anilines
作者:Alankrita Garia、Jatin Grover、Nidhi Jain
DOI:10.1002/ejoc.202100756
日期:2021.8.6
A metal-free synthesis of anthranils from ortho-carbonyl anilines using PhIO as a sole reagent under ambient conditions is described. No external additives are required, the reaction has broad substrate scope and delivers anthranils in excellent yields via oxidative heterocyclization.
Abstract Lithium tetrafluoroborate has been demonstrated for the first time to be an efficient catalyst in intermolecular aza-Michael addition aromatic amines to electron deficient alkenes. Suitability of the same catalyst in intramolecular aza-Michael addition leading 2-aryl-2,3-dihydroquinolin-4(1H) ones has also been described.
Eco-friendly polyethylene glycol promoted Michael addition reactions of α,β-unsaturated carbonyl compounds
作者:Dalip Kumar、Gautam Patel、Braja G. Mishra、Rajender S. Varma
DOI:10.1016/j.tetlet.2008.09.116
日期:2008.12
Intra- and inter-nucleophilic addition reactions of different α,β-unsaturatedcarbonylcompounds were found to be highly effective without any additives in PEG-400 as a recyclable reaction medium under neutral conditions.