Abstract A palladium-catalyzed [4 + 1] cycloaddition of prop-2-yn-1-ones with double isocyanides is developed herein. The transformation worked well to produce a series of 2-amino-4-cyanofurans with high efficiency and a broad reaction scope. Based on mechanism studies, it is believed that the palladium-catalyzed [4 + 1] imidoylative cycloaddition of prop-2-yn-1-ones was concerted. Treated with aryl
Bifunctional Borane Catalysis of a Hydride Transfer/Enantioselective [2+2] Cycloaddition Cascade
作者:Ming Zhang、Xiao‐Chen Wang
DOI:10.1002/anie.202106168
日期:2021.7.26
Herein, we present a mild and efficient method for synthesizing enantioenriched tetrahydroquinoline-fused cyclobutenes through a cascade reaction between 1,2-dihydroquinolines and alkynones with catalysis by chiral spiro-bicyclic bisboranes. The bisboranes served two functions: first they catalyzed a hydride transfer to convert the 1,2-dihydroquinoline substrate to a 1,4-dihydroquinoline, and then
(Benzoyliodomethyl)triphenylphosphonium Iodide: A Convenient Reagent for Direct Synthesis of Arylethynyl Phenyl Ketones by Chain Extension of Aldehydes
Reaction between (benzoyliodomethyl)triphenylphosphonium iodide, potassium carbonate and various aromatic aldehydes in a liquid-solid two-phase system, gives arylethynyl phenyl ketones in good yield.