The First Enantioselective Organocatalytic Mukaiyama−Michael Reaction: A Direct Method for the Synthesis of Enantioenriched γ-Butenolide Architecture
作者:Sean P. Brown、Nicole C. Goodwin、David W. C. MacMillan
DOI:10.1021/ja029095q
日期:2003.2.1
an important chiralsynthon found among many natural isolates. The (2S,5S)-5-benzyl-2-tert-butyl-imidazolidinone amine catalyst has been found to mediate the conjugate addition of a wide variety of substituted and unsubstituted silyloxy furans to unsaturated aldehydes. A diverse range of aldehyde substrates can be accommodated in this new organocatalytic transformation. Application of this new asymmetric
1,4-Addition of silicon dienoates to α,β-unsaturated aldehydes catalyzed by in situ-generated silicon Lewis acid
作者:Hikaru Yanai、Arata Takahashi、Takeo Taguchi
DOI:10.1039/c0cc02438d
日期:——
In situ-generated silyl methide species (R(3)Si-CTf(2)R') effectively catalyzed the reaction of beta-substituted alpha,beta-unsaturated aldehydes with silicon dienoates such as 3-bromo-2-TESO-furan to give the corresponding gamma-adducts with excellent 1,4-selectivity and good anti selectivity.
Asymmetric Vinylogous Michael Reaction of α,β-Unsaturated Aldehyde with Buteno-4-lactone
作者:Xiaoyan Luo、Zhiqiang Zhou、Feng Yu、Xin Li、Xinmiao Liang、Jinxing Ye
DOI:10.1246/cl.2011.518
日期:2011.5.5
The asymmetric vinylogous Michaelreactions of α,β-unsaturated aldehydes with γ-butenolide(buteno-4-lactone) were efficiently catalyzed by the Jorgensen–Hayashi catalyst and LiOAc. The desired prod...
Re-visiting the diastereoselectivity of organocatalytic conjugate addition of 2-trimethylsiloxyfuran to trans-crotonaldehyde
作者:Liubo Li、Anton El Khoury、Brennan O. Clement、Patrick G. Harran
DOI:10.1016/j.tetlet.2021.153056
日期:2021.5
We describe the re-assignment of configuration previously ascribed to product diastereomers resultant from imidazolidinone-catalyzed conjugateaddition of 2-trimethylsiloxyfuran to trans-crotonaldehyde. A modified procedure that uses a diphenylprolinol catalyst was subsequently developed to selectively provide the ‘syn’ diastereomeric product in high enantiomeric excess on decagram scales.
我们描述了先前归因于由咪唑烷酮催化的将2-三甲基甲硅烷氧基呋喃加成反式巴豆醛的共轭加成物所产生的产物非对映异构体的构型的重新分配。随后开发了使用二苯基脯氨醇催化剂的改进方法,以十毫克级的对映体过量,选择性地提供“ syn ”非对映体产物。