p-toluenesulphonyl-hydrazone of adamantanone;2-adamantanone tosylhydrazone;2-adamantone tosylhydrazone;adamantonetosylhydrazone;Adamanton-tosylhydrazon;N-(2-adamantylideneamino)-4-methylbenzenesulfonamide
N-Tosylhydrazones generated in situ from cyclicketones smoothly underwent a [3 + 2] cycloaddition to afford saturated spirocyclic pyrazoles and further transformed to the fused analogues via a ringexpansion in certain cases. An inexpensive and renewable resource, calcium carbide, was utilized as the carbon source in the ringexpansion. The salient features of this reaction include widely available
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.
Photo‐Induced Homologation of Carbonyl Compounds for Iterative Syntheses
作者:Hua Wang、Shun Wang、Vincent George、Galder Llorente、Burkhard König
DOI:10.1002/anie.202211578
日期:2022.12.5
A photo-induced Büchner-Curtius-Schlotterbeck type reaction for carbonyl homologation is described. The protocol allows the use of carbonyl compounds as safe and readily available diazo precursors through direct photoexcitation of corresponding N-tosylhydrazone anions. Functionalized aliphatic aldehydes and ketones are prepared in a practical and iterative manner.
Polycyclic Pyrazoles from Alkynyl Cyclohexadienones and Nonstabilized Diazoalkanes via [3 + 2]-Cycloaddition/[1,5]-Sigmatropic Rearrangement/Aza-Michael Reaction Cascade
center substituted” polycyclic pyrazoles from alkynyl cyclohexa-2,5-dienones and nonstabilized diazoalkanes via sequential [3 + 2]-cycloaddition/[1,5]-sigmatropic rearrangement and aza-Michael reactions is reported. The developed process is highly regioselective and stereoselective. It employs a wide substrate scope to furnish structurally diverse linear and bridged [4.4.n.0] ring-fused pyrazoles in moderate
一种通过连续[3 + 2]-环加成/[1,5]-σ重排和氮杂-迈克尔反应从炔基环己-2,5-二烯酮和不稳定重氮烷立体选择性合成“全中心取代”多环吡唑的有效方法被报道。所开发的过程具有高度区域选择性和立体选择性。它采用广泛的基材范围来提供结构多样的线性和桥接[4.4。 n .0]稠环吡唑,产率中等至良好。还展示了一锅法和克级合成以及合成转化。
Bis(triphenylphosphine)copper (I) tetrahydroborate in the reduction of -toluenesulphonylhydrazones and 2,4,6-triisopropylbenzenesulphonyl hydrazones (trisyl hdyrazones) to alkanes