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)。
Asymmetric [3+2] Cycloaddition of Olefins with Morita–Baylis–Hillman Carbonates Catalyzed by BINOL-Based Bifunctional Phosphine
作者:Hai-Lei Cui、Xue Tang、Meng-Fan Li、Xing-Jie Xu、Yin Shi
DOI:10.1055/s-0037-1611752
日期:2019.4
series of novel BINOL-based phosphines. These bifunctional organocatalysts can be used in the [3+2] cycloaddition of electron-deficient olefins and Morita–Baylis–Hillman (MBH) carbonates. Moderate to excellent yields (up to >99%) and good to excellent enantioselectivities (up to 95% ee) can be obtained in the cycloaddition reaction of maleimides and MBH carbonates. The application of these novel phosphines
Highly Enantioselective [3+2] Annulation of Morita-Baylis-Hillman Adducts Mediated by L-Threonine-Derived Phosphines: Synthesis of 3-Spirocyclopentene-2-oxindoles having Two Contiguous Quaternary Centers
作者:Fangrui Zhong、Xiaoyu Han、Youqing Wang、Yixin Lu
DOI:10.1002/anie.201102094
日期:2011.8.16
Spiral bound: The Morita–Baylis–Hillmanadducts were employed as C3 synthons in the asymmetric [3+2] annulation with malonitrile substrates using L‐threonine‐derived 1 as the catalyst (see scheme). The reaction is highly regioselective and stereoselective, and affords optically enriched 3‐spirocyclopentene‐2‐oxindoles containing twocontiguousquaternarycenters. Boc=tert‐butoxycarbonyl, PMB=para‐methoxybenzyl
Chiral Lewis bases facilitated the synthesis of highly functionalized spirooxindoles containing α-exo-methylene-γ-butyrolactones in high yields (76–92 %) and excellent enantioselectivities (up to 98 % ee) at ambient temperature.