Copper-Catalyzed Remote sp3 C−H Chlorination of Alkyl Hydroperoxides
摘要:
A copper-catalyzed methodology to functionalize remote sp(3) C-H bonds in alkyl hydroperoxides is presented. The atom-transfer chlorination utilizes simple ammonium chloride salts as the chlorine source, and the internal redox process requires no external redox reagents.
Phase-Transfer Catalyzed Addition of Hydrogen Cyanide to<i>N</i>-Substituted Hydrazones
作者:Toshiro Chiba、Mitsuhiro Okimoto
DOI:10.1055/s-1990-26831
日期:——
In a two-phase system consisting of aqueous sodium cyanide and an inert organic solvent and containing a phase-transfer catalyst, ketone benzoylhydrazones, tosylhydrazones, and methoxycarbonylhydrazones upon addition of acetic acid readily add hydrogen cyanide to give 2-substituted 1-(1-cyanoalkyl)hydrazines.
A palladium-catalyzedcoupling of allenylphosphine oxides with N-tosylhydrazones, leading to phosphinyl [3]dendralenes, is established. The couplingreaction can be catalyzed by bis(triphenylphosphine)palladium chloride with sodium pivalate as a key additive, presumably via π-allyl-Pd-carbene intermediates. This protocol provides an expedient synthesis of unprecedented multisubstituted phosphinyl [3]dendralenes
Two C–O Bond Formations on a Carbenic Carbon: Palladium-Catalyzed Coupling of <i>N</i>-Tosylhydrazones and Benzo-1,2-quinones To Construct Benzodioxoles
A novel and efficient method for the formation of two C–O bonds on a carbenic carbon is reported. This palladium-catalyzed coupling of N-tosylhydrazones and benzo-1,2-quinones were involved the process of carbonylylidesgeneration, aromatization, and intramolecular nucleophilic addition, delivering various useful benzodioxoles in high yields.