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
Ferric Chloride Hexahydrate-Catalyzed Highly Regio- and Stereoselective Conjugate Addition Reaction of 2,3-Allenoates with Grignard Reagents: An Efficient Synthesis of β,γ-Alkenoates
作者:Guobi Chai、Zhan Lu、Chunling Fu、Shengming Ma
DOI:10.1002/adsc.200900091
日期:2009.8
Ferricchloride hexahydrate was shown to be an efficient catalyst for the conjugate addition of 2,3-allenoates with alkyl-, aryl-, or vinyl-Grignard reagents to synthesize polysubstituted β,γ-unsaturated alkenoates with high regio- and stereoselectivity. The in situ formed magnesium dienolate may readily react with different electrophilic reagents under different reaction conditions with or without
CuCl-catalyzed stereoselective conjugate addition of Grignard reagents to 2,3-allenoates
作者:Jian He、Zhan Lu、Guobi Chai、Chunling Fu、Shengming Ma
DOI:10.1016/j.tet.2012.01.027
日期:2012.3
CuCl was found to be an efficient catalyst for the conjugateaddition of 2,3-allenoates with Grignardreagents to synthesize poly-substituted β,γ-unsaturated alkenoates with high stereoselectivity in good to excellent yields. Primary, secondary, and tertiary alkyl, vinyl or phenyl Grignardreagents may all be used.
Iron-Catalyzed Highly Regio- and Stereoselective Conjugate Addition of 2,3-Allenoates with Grignard Reagents
作者:Zhan Lu、Guobi Chai、Shengming Ma
DOI:10.1021/ja075750o
日期:2007.11.28
An efficient highly regio- and stereoselective iron-catalyzed conjugate addition of 2,3-allenoates with primary or secondary alkyl, phenyl, or vinyl Grignardreagents to synthesize multi-substituted β,γ-unsaturated enoates has been reported. The in situ formed magnesium dienolate may readily react with different electrophilic reagents to construct an allylic quaternary carbon at the α-position of the
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
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