Superparamagnetic Nanoparticle-Supported (S)-Diphenyl- prolinol Trimethylsilyl Ether as a Recyclable Catalyst for Asymmetric Michael Addition in Water
作者:Bang Gen Wang、Bao Chun Ma、Qiong Wang、Wei Wang
DOI:10.1002/adsc.201000508
日期:2010.11.22
A new superparamagneticnanoparticle-supported (S)-diphenylprolinol trimethylsilylether (Jørgensen–Hayashi catalyst) was synthesized and applied for the asymmetricMichaeladdition of aldehydes to nitroalkenes in water, which gives products in moderate to good yields (up to 96%), good enantioselectivity (up to 90% ee) and diastereoselectivities (up to 99:1). The immobilized catalyst could be easily
Asymmetric Michael reaction of aldehydes with β-nitroalkenes catalyzed by pyrrolidine-camphor derived organocatalysts bearing hydrogen-bond donors
作者:Jiang Weng、Hui-Bing Ai、Ren-Shi Luo、Gui Lu
DOI:10.1002/chir.21991
日期:2012.4
derived organocatalysts were designed and synthesized. These organocatalysts were used for direct Michaelreaction of aldehydes with nitroalkenes to give the desired γ‐nitrocarbonyl compounds in high yields (up to 99%), high diastereoselectivities (syn:anti up to 92:8), and good to excellent enantioselectivities (up to 94% ee). Possible transition‐state model was also proposed for this asymmetric transformation
POSS supported diarylprolinol silyl ether as an efficient and recyclable organocatalyst for asymmetric Michael addition reactions
作者:Wei Zheng、Cuifen Lu、Guichun Yang、Zuxing Chen、Junqi Nie
DOI:10.1016/j.catcom.2015.01.002
日期:2015.3
The POSS supported (S)-α,α-diphenylprolinoltrimethylsilylether catalyst was synthesized and applied in the asymmetric Michael addition reactions of aldehydes and arylnitroalkenes, providing the products in good yields with excellent enantioselectivities and good diastereoselectivities. The POSS supported catalyst can be readily recycled and reused for further transformations at least eight cycles
Highly efficient asymmetric Michael addition of aldehydes to nitroalkenes with 4,5-methano-l-proline as organocatalysts
作者:Han Yu、Mouming Liu、Sheng Han
DOI:10.1016/j.tet.2014.08.069
日期:2014.11
5-methano-l-prolines were used as chiral organocatalysts in asymmetricMichaeladdition of aldehydes to nitroolefins. These proline-like catalysts are unique for their rigid bicyclic structure with a cyclopropane and two H atoms attached to the bridgehead C atoms lying on the same side of the ring. They therefore showed high efficiency in asymmetricMichaeladdition of aldehydes to nitroolefins. Under the optimal conditions
intermediate, were used as chiral organocatalysts in asymmetricMichaeladditionreactions of aldehydes to nitroolefins. These proline-like catalysts are unique for their rigid bicyclic structure with two H atoms attached to the bridgehead C atoms lying on the opposite side of the ring. They therefore showed high efficiency in asymmetricMichaeladditions of aldehydes to nitroolefins. Under the optimal conditions