A rhodium-catalyzed annulative reaction between azobenzenes and nitrosoarenes has been developed, leading to a series of phenazines in moderate to good yields. This procedure proceeds with sequential chelation-assisted addition of aryl C–H to nitrosoarenes and ring closure by electrophilic attack of azo group to aryl. During this transformation, the azo group served as not only a traceless directing
Skeletal Rearrangement in the Zn<sup>II</sup>-Catalyzed [4+2]-Annulation of Disubstituted<i>N</i>-Hydroxy Allenylamines with Nitrosoarenes to Yield Substituted 1,2-Oxazinan-3-one Derivatives
作者:Pankaj Sharma、Rai-Shung Liu
DOI:10.1002/chem.201602579
日期:2016.10.24
reports zinc‐catalyzed [4+2]‐annulation reactions of disubstituted N‐hydroxy allenylamines with nitrosoarenes to afford substituted 1,2‐oxazinan‐3‐ones with a skeletal rearrangement. This annulation is applicable to a reasonable scope of allenylamines and nitrosoarenes. Our control experiments indicate that nitrosobenzene can also implement this annulation through a radical annulation path, but with
We describe a short, efficient approach for the synthesis of three novel isotopelabeled azobenzene photoswitches. The synthesis is based on commercially available fully isotopelabeled precursors. The target molecules have been obtained in good yields, checked for purity, and identified by NMR and IR spectroscopy and a variety of standard analytical methods (UV-vis, mp, ESI-MS, elemental analysis)
Reaction of aromatic nitroso compounds with chemical models of ‘thiamine active aldehyde’
作者:Luísa M. Ferreira、M. Manuel B. Marques、Paulo M.C. Glória、Humberto T. Chaves、João-Pedro P. Franco、Isabel Mourato、José-Rafael T. Antunes、Henry S. Rzepa、Ana M. Lobo、Sundaresan Prabhakar
DOI:10.1016/j.tet.2008.06.008
日期:2008.8
Aromaticnitrosocompounds in the presence of base and 2-(α-hydroxyalkyl)-3,4-dimethylthiazolium trifluoromethanesulfonate and related salts furnish in variable yields O- and N-acyl-aryl hydroxylamines and 3,4-dimethylthiazolium trifluoromethanesulfonate. A primary kinetic isotope effect of 4.9, obtained for the appropriate 2α-deuterated thiazolium salt, points to the C2α–H bond cleavage as the rate
Reaction between Δ2-oxazolin-5-ones and nitrosobenzene. Formation of 1,2,4-oxadiazolines
作者:H. Rodríguez、H. Pavez、A. Márquez、P. Navarrete
DOI:10.1016/s0040-4020(01)97624-0
日期:——
2,4-diphenyl- and 2-p-methylphenyl-4-phenyl-Δ2-oxazolin-5-ones react at 80–110°C with nitrosobenzene to give benzamidines. However, reactions conducted at room temperature afford in high yield, the heretofore undescribed Δ4-1,2,4-oxadiazolin-3-carboxylic acids by regiospecific 1,3-dipolar cycloaddition. Thermal decomposition of the oxadiazolinecarboxylic acids gives the corresponding benzamidines.