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
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
Organic Iron for the PdCl2/FeCl3-Cocatalyzed Coupling Cyclization of 2,3-Allenoates in the Presence of Allylic Bromides
作者:Bo Chen、Shengming Ma
DOI:10.1002/chem.201002553
日期:2011.1.17
Newcoupling: The interaction of ferric chloride with 2,3‐allenoates generates a 2‐(5H)‐furanonyl iron species, which was observed to readily undergo transmetalation with PdCl2 to result in coupling with allylic bromides (see scheme). Based on this reaction, an efficient method for the synthesis of β‐allyl polysubstituted butenolides from the easily available allylic bromides and 2,3‐allenoates has
An Efficient Double 1,2-Addition Reaction of 2,3-Allenoates with Allyl Magnesium Chloride
作者:Bo Chen、Zhan Lu、Guobi Chai、Chunling Fu、Shengming Ma
DOI:10.1021/jo801809j
日期:2008.12.5
2-addition reaction of 2,3-allenoates with allyl magnesiumchloride at room temperature in the absence of any transition metal catalyst provides an efficient method for the synthesis of tertiary alpha-allenols. The optically active allenol could be prepared from the reaction of the optically active 2,3-allenoate without obvious racemization of the axial chirality. Under different reaction conditions
Metal Alkoxide Promoted Regio- and Stereoselective CO and CC Metathesis of Allenoates with Aldehydes
作者:Minyan Wang、Zhao Fang、Chunling Fu、Shengming Ma
DOI:10.1002/anie.201310183
日期:2014.3.17
The reaction of 2,3‐allenoates and aldehydes in the presence of an alkoxide affords alkyl 4,5‐diaryl‐3‐oxo‐2‐propylpent‐4(E)‐enoates and cis‐3,4‐diaryloxetanes through a formal CO and CCmetathesis. A mechanism for this reaction has been proposed.