CyclocarbonylativeSonogashirareactions of ortho-ethynylbenzamides have been investigated. The process is carried out under CO pressure, in the presence of a very small amount of PdCl2(PPh3)2 (0.4 mol %) as a catalytic precursor and without the need for a Cu salt as the co-catalyst. 2-Ethynylbenzamide reacted successfully with iodoarenes bearing electron-withdrawing and electron-donating groups, giving
Heteroannulation through combined palladium catalysed and Friedel-Crafts reactions strategy: Synthesis of 3-alkylidene isoindolin-1-ones
作者:Nitya G. Kundu、M.Wahab Khan、Rupa Mukhopadhyay
DOI:10.1016/s0040-4020(99)00719-x
日期:1999.10
The palladium-catalysed reactions of 2-iodobenzamides 1–5 with trimethylsilyl acetylene 6 led to 2-(2-trimethylsilyl)ethynyl benzamides 7–11 in excellent yields. The 2-(2-trimethylsilyl)ethynyl benzamides 7–11 underwent Friedel-Crafts reactions with acid chlorides 12–17 or anhydride 18 smoothly under mild conditions yielding the 3-alkylidene isoindolin-1-ones 19–38.
Stereoselective Synthesis of 3-Methyleneisoindolin-1-ones via Base-Catalyzed Intermolecular Reactions of Electron-Deficient Alkynes with <i>N</i>-Hydroxyphthalimides
作者:Xin Chen、Fei-Fei Ge、Tao Lu、Qing-Fa Zhou
DOI:10.1021/acs.joc.5b00002
日期:2015.3.20
Highly stereoselective intermolecular reactions of electron-deficient alkynes with N-hydroxyphthalimides for efficient construction of N-unprotected 3-methyleneisoindolin-1-ones have been developed through base catalytic strategies. The reaction of alkynoates with N-hydroxyphthalimides catalyzed by Bu3P in DMF at 150 degrees C gave the corresponding 3-methyleneisoindolin-1-ones with a (Z)-configuration, while the reaction of alkynoates with N-hydroxyphthalimides catalyzed by K2CO3 in DMF at 60 degrees C gave the corresponding 3-methyleneisoindolin-1-ones with an (E)-configuration, and (Z)-3-methyleneisoindolin-1-ones were obtained when alkyne ketones reacted with N-hydroxyphthalimide.