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
“Bottom-Up” Embedding of the Jørgensen-Hayashi Catalyst into a Chiral Porous Polymer for Highly Efficient Heterogeneous Asymmetric Organocatalysis
作者:Chang An Wang、Zhi Kun Zhang、Tao Yue、Ya Lei Sun、Lei Wang、Wei David Wang、Yuan Zhang、Chong Liu、Wei Wang
DOI:10.1002/chem.201200753
日期:2012.5.29
construction of a robust chiralporouspolymer (JH‐CPP) embedded with the Jørgensen–Hayashicatalyst (JH) has been successfully achieved for highlyefficientheterogeneousorganocatalysis. The high BET surface area, wide openings and interconnected nanopores of JH‐CPP increase the accessibility of catalytic sites and as such the catalyst shows excellent activity in catalyzing the asymmetric Michael addition
A highly efficient access to enantiopure tetrahydropyridines: dual-organocatalyst-promoted asymmetric cascade reaction
作者:Hua Lin、Yu Tan、Wen-Jie Liu、Zhi-Cheng Zhang、Xing-Wen Sun、Guo-Qiang Lin
DOI:10.1039/c3cc40690c
日期:——
A highly efficient cascade process of Michael–aza-Henry–hemiaminalization–dehydration was established for the construction of enantiopure tetrahydropyridines using the combination of prolinol trimethylsilyl ether and cinchona alkaloid catalysts. This new approach allowed for the application of aliphatic imines, generated in situ from aldehydes and amines. Good yields (up to 90%), high enantio- (up to >99% ee) and diastereoselectivities (>99 : 1 d.r. in all cases) were achieved for a broad spectrum of substrates under mild conditions.
Organocatalyzed stereoselective construction of N-formylpiperidines via a Michael-aza-Henry-hemiaminalization reaction cascade
作者:Ruchi Chawla、Ankita Rai、Atul K. Singh、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2012.07.097
日期:2012.9
An efficient asymmetricsynthesis of N-formylpiperidines via an organocatalytic Michael-aza-Henry-hemiaminalization reaction cascade of an aldehyde, a nitroalkene, and an N-arylideneformamide is reported. The reaction is triggered by diphenylprolinol trimethylsilyl ether and creates two C–C and one C–N bonds leading to the formation of highly enantio-enriched N-formylpiperidines with five contiguous
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