Catalyst-free inverse-electron-demand aza-Diels–Alder reaction of 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes: access to polysubstituted tetrahydropyridines
Phosphine-catalyzed asymmetric [4+1] annulation of Morita–Baylis–Hillman carbonates with dicyano-2-methylenebut-3-enoates
作者:Xiao-nan Zhang、Hong-Ping Deng、Long Huang、Yin Wei、Min Shi
DOI:10.1039/c2cc34619b
日期:——
asymmetric [4+1] annulation of MBH carbonates with dicyano-2-methylenebut-3-enoates has been developed for the first time, providing an efficient and enantioselectivesynthesis of highlyfunctionalized cyclopentenes bearing one all-carbon quaternarystereogeniccenter.
Phosphine-Catalyzed [3 + 2] Cycloaddition of 4,4-Dicyano-2-methylenebut-3-enoates with Benzyl Buta-2,3-dienoate and Penta-3,4-dien-2-one
作者:Xiao-Nan Zhang、Min Shi
DOI:10.1021/cs300751a
日期:2013.4.5
4,4-Dicyano-2-methylenebut-3-enoates are employed in the phosphine-catalyzed [3 + 2] cycloaddition with allenoates for the first time, affording regiospecific [3 + 2]-annulation products in moderate to good yields. The multifunctional chiral thiourea-phosphines having an axially chiral binaphthyl scaffold are effective catalysts for the asymmetric variant of this reaction, giving the alpha-regioisomers in good yields and moderate enantioselectivities.
Phosphine-Catalyzed Annulations of 4,4-Dicyano-2-Methylenebut-3-enoates with Maleimides and Maleic Anhydride
作者:Xiao-Nan Zhang、Gen-Qiang Chen、Xiang-Ying Tang、Yin Wei、Min Shi
DOI:10.1002/anie.201406100
日期:2014.9.26
A novel phosphine‐catalyzed [4+1] annulation of maleimides with 4,4‐dicyano‐2‐methylenebut‐3‐enoates has been developed to afford spirocyclic products, and the maleimides serves as C1 synthons. Moreover, a phosphine‐catalyzed formal [3+2] annulation between 4,4‐dicyano‐2‐methylenebut‐3‐enoates and maleic anhydride has been also achieved, and maleic anhydride behaved as a C3 synthon in the reaction
Catalyst-free inverse-electron-demand aza-Diels–Alder reaction of 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes: access to polysubstituted tetrahydropyridines
An inverse-electron-demand aza-Diels–Alder reaction between 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes under catalyst-free and additive-free conditions was developed.