The first highly enantioselective allylic–allylic alkylation of α,α‐dicyanoalkenes and Morita–Baylis–Hillman carbonates by dualcatalysis of (DHQD)2AQN and (S)‐BINOL has been investigated. Excellent stereoselectivities have been achieved for a broad spectrum of substrates (d.r. > 99:1, up to 99 % ee). The multifunctional allylic products could be efficiently converted to a range of complex chiral cyclic
Lewis base-catalyzed cyanation of Morita-Baylis-Hillman carbonates. Synthesis of allylamine derivatives
作者:Hai Ma、Feng Sui、Qing-He Zhao、Ning Zhang、Yi Sun、Jing Xian、Meng-Jiao Jiao、Yu-ling Liu、Zhi-Min Wang
DOI:10.1016/j.tetlet.2017.07.038
日期:2017.8
DABCO-catalyzed cyanation of MBH carbonates via 1,3-proton shift transfer is reported. The adducts of cyanation are converted in one step to allylic amines derivatives. The salient features of this reaction include readily available starting materials, mild conditions, broad substrate scope, high efficiency and valuable further applications. The process of the 1,3-proton shift transfer was conducted
Enanatiopure β‐methyl‐γ‐monofluoromethyl alcohols were prepared from the allylic alkylation between fluorobis(phenylsulfonyl)methane with Morita–Baylis–Hillmancarbonates. The reaction was catalyzed by using the Cinchonaalkaloid derivative, (DHQD)2AQN. The origin of the stereoselectivity was verified by DFT methods. Calculated geometries and relative energies of various transition states strongly
Direct Synthesis of Dihydropyrrolo[2,1‐
<i>a</i>
]Isoquinolines through FeCl
<sub>3</sub>
Promoted Oxidative Aromatization
作者:Hai‐Lei Cui、Lu Jiang、Hao Tan、Si Liu
DOI:10.1002/adsc.201900756
日期:2019.10.22
We have developed a straightforward FeCl3 promoted synthesis of dihydropyrrolo[2,1‐a]isoquinolinesthrough formal (3+2) cycloaddition/oxidative aromatization cascade of dihydroisoquinoline with Morita‐Baylis‐Hillman carbonates (up to 96% yield). Further modifications of the obtained products were successful through simple chemical transformations providing a diverse range of natural product‐like molecules
我们已经开发出一种简单的FeCl 3促进的二氢吡咯并[2,1- a ]异喹啉的合成,方法是通过二氢异喹啉与Morita-Baylis-Hillman碳酸盐的正式(3 + 2)环加成/氧化芳构化级联(产率高达96%)。通过简单的化学转化成功获得了进一步的修饰产物,提供了多种天然产物样分子(12个例子)。
The peroxy-asymmetric allylic alkylation of hydroperoxyalkanes with Morita–Baylis–Hillmancarbonates was catalysed by modifiedcinchonaalkaloids (up to 93% ee), from which chiral α-methylene-β-hydroxy esters could be efficiently derived.