Study on the selectivity in the electrophilic monofluorination of 2,3-allenoates with Selectfluor™: an efficient synthesis of 4-fluoro-2(5H)-furanones and 3-fluoro-4-oxo-2(E)-alkenoates
Study on the selectivity in the electrophilic monofluorination of 2,3-allenoates with Selectfluor™: an efficient synthesis of 4-fluoro-2(5H)-furanones and 3-fluoro-4-oxo-2(E)-alkenoates
Studies on the Intermolecular Hydroarylation of N-Ts- or N-Ac-Protected Indoles and 2,3-Allenoates
作者:Zhao Fang、Chunling Fu、Shengming Ma
DOI:10.1002/ejoc.201001661
日期:2011.3
An operationally simple, TFA-promoted regioselective hydroarylation reaction of 2,3-allenoates with N-Ts- or N-Ac-indoles to afford 4-indolyl-4-arylbut-2-enoates is described. A series of substrates was tested, and the E/Z selectivity was found to depend on the reaction temperature and time. A mechanism involving the formation of E and Z allylic carbocations generated in situ from the reaction of 2
Controlled Reactions of 2,3-Allenoates with a 1,3-Diketone Catalyst Effect
作者:Zhao Fang、Chunling Fu、Shengming Ma
DOI:10.1002/ejoc.201101852
日期:2012.5
Two types of reactions of 2,3-allenoates with 1,3-diketones under different reaction conditions are described: under palladium catalysis, the relatively electron-rich C=C bonds are attacked to afford ethyl (2E)-4-acyl-2-alkyl-4-aryl-6-oxohept-2-enoates exclusively with dicyclohexyl(2,4,6-trimethoxyphenyl)phosphane as the ligand; under Cu(OAc)2 catalysis, 4-[R–C(=O)–]-(LB-Phos) 3,5-dialkyl-3-(2-oxo
Oxytrifluoromethylthiolation of 2,3‐Allenoates with Trifluoromethanesulfinyl Chloride: A Synthetic Approach to Trifluoromethylthiolated 4‐Oxo‐2(E)‐alkenoates and Furans
作者:Jun Yan、Min Jiang、Li‐Ping Song、Jin‐Tao Liu
DOI:10.1002/adsc.202000304
日期:2020.7.29
The trifluoromethylthiolation‐based bifunctionalization of 2,3‐allenoates is demonstrated. Using trifluoromethanesulfinylchloride as cheap and easily available SCF3 source, trifluoromethylthiolated4‐oxo‐2(E)‐alkenoate and furan derivatives were synthesized via oxytrifluoromethylthiolation under different conditions, respectively. A possible mechanism was proposed based on reaction results and control
[PdCl2(MeCN)2]-Catalyzed Highly Regio- and Stereoselective Allylation of Electron-Rich Arenes with 2,3-Allenoates
作者:Zhao Fang、Chunling Fu、Shengming Ma
DOI:10.1002/chem.200903012
日期:2010.4.6
Selective allylation: Several electron‐donating arenes such as 1,3,5‐trimethoxybenzene, anisole, and phenol underwent palladium‐catalyzed selective allylation in TFA/dimethylacetamide (DMA) under mild conditions with 2,3‐allenoates (see scheme). The reaction afforded substituted 4,4‐diarylbut‐2(E)‐enoates in moderate yields with high regio‐ and stereoselectivity.