在 etudiie la migration thermique d'hydrogene [1,2] dans le (methylphenyl) methylene qui导管 au 苯乙烯,cette 转位取决于堡垒的温度。Par contre, le deplacement thermique-[1,4] d'hydrogene dans l'ο-tolylmethylenetriplets qui导管 a l'o-xylylene se produit a des temperature de l'ordre de 4,6 K
Palladium-Catalyzed Cross-Coupling Reactions of Electron-Deficient Alkenes with<i>N</i>-Tosylhydrazones: Functional-Group-Controlled CC Bond Construction
作者:Huanfeng Jiang、Wei Fu、Huoji Chen
DOI:10.1002/chem.201202051
日期:2012.9.17
palladium‐catalyzed cross‐coupling reaction of electron‐deficient alkenes with N‐tosylhydrazones, which affords diverse CC bonds resulting from the functional‐group‐controlled effect, is reported (see scheme). These cascade transformations present remarkable stereoselectivity and a high synthetic potential. The presence of water substantially promotes both reaction routes.
Palladium-Catalyzed Multi-Component Reactions of<i>N</i>-Tosylhydrazones, 2-Iodoanilines and CO<sub>2</sub>towards 4-Aryl-2-Quinolinones
作者:Song Sun、Wei-Ming Hu、Ning Gu、Jiang Cheng
DOI:10.1002/chem.201604256
日期:2016.12.23
A palladium‐catalyzed three‐component reaction between N‐tosylhydrazones, 2‐iodoanilines and atmospheric pressure CO2 was developed whereby a tandem carbene migration insertion/lactamization strategy afforded 4‐aryl‐2‐quinolinones in moderate to good yields. Notably, a wide range of functional groups were tolerated in this procedure. This protocol features the simultaneous formation of four novel bonds;
carbopalladation reaction of haloalkynes is presented. Remarkably, the four‐time carbopalladation process converts the carbon‐carbon triple bonds of haloalkynes stepwise into carbon–carbon double bonds, and finally to carbon‐carbon single bonds. Features of this reaction are that the carbon‐carbon double bonds of stable vinyl palladium intermediates are transformed into carbon‐carbon single bonds with
A palladium-catalyzed allylic C−H oxidative allylation of N-tosylhydrazones to synthesize skipped 1,4-dienes is demonstrated. This direct allylic alkylation reaction has excellent site selectivity, tolerates a wide range of functional groups, and affords 1,4-dienes in moderate to good yield. Moreover, this olefination method allows the regio- and stereoselective synthesis of 1,4-dienes containing a