Highly Enantioselective Organocatalytic Conjugate Addition of Nitromethane to α,β-Unsaturated Aldehydes: Three-Step Synthesis of Optically Active Baclofen
作者:Liansuo Zu、Hexin Xie、Hao Li、Jian Wang、Wei Wang
DOI:10.1002/adsc.200700353
日期:2007.12.10
An efficient, organocatalytic, highlyenantioselective, conjugateaddition reaction of nitromethane with α,β-unsaturated aldehydes has been developed. The process serves as the key step for a practical 3-step synthesis of chiral baclofen, an antispastic drug.
An efficient enantioselective method for asymmetric Michael addition of nitroalkanes to α,β-unsaturated aldehydes
作者:Yongcan Wang、Pengfei Li、Xinmiao Liang、Tony Y. Zhang、Jinxing Ye
DOI:10.1039/b717000a
日期:——
The addition of nitroalkanes to alpha,beta-unsaturated aldehydes under the catalysis of (S)-2-(diphenyl(trimethylsilyloxy)methyl)pyrrolidine and lithium acetate as additive afforded gamma-nitroaldehydes in good yield and up to 97% ee.
Highly Active Water-Soluble and Recyclable Organocatalyst for the Asymmetric 1,4-Conjugate Addition of Nitroalkanes to α,β-Unsaturated Aldehydes
作者:Subrata K. Ghosh、Zilong Zheng、Bukuo Ni
DOI:10.1002/adsc.201000344
日期:2010.10.4
A novel strategy for the catalyticasymmetric conjugate addition of nitroalkanes to α,β-unsaturatedaldehydes in aqueous media has been developed by using diarylprolinol silyl ether in combination with benzoic acid as a water-soluble organocatalyst providing the desired adducts in good to excellent enantioselectivities (up to 95% ee). This catalyst can be recycled at least five times with only a slight
Organocatalytic diastereoselective synthesis of chiral decalines through the domino Claisen–Schmidt/Henry reaction
作者:Adluri B. Shashank、Dhevalapally B. Ramachary
DOI:10.1039/c5ob00562k
日期:——
General and operative domino Claisen–Schmidt/Henry (CS/H) reaction has been revealed to obtain highly substituted chiral decalines in good yields with excellent ees and des by using push–pull enamine catalysis.