Brucine-Derived Amino Alcohol Catalyzed Asymmetric Henry Reaction: An Orthogonal Enantioselectivity Approach
摘要:
A new approach to both enantioenriched Henry products is developed by use of different molecularities of metal-ligand complexes generated from Cu(I) and Zn(II) metals with readily available chiral amino alcohol 1.
Orthogonal Enantioselectivity Approaches Using Homogeneous and Heterogeneous Catalyst Systems: Friedel-Crafts Alkylation of Indole
作者:Hun Young Kim、Sungkyung Kim、Kyungsoo Oh
DOI:10.1002/anie.201001484
日期:2010.6.14
With or without support? The complementary homogeneous and heterogeneouscatalystsystems have been developed for the catalytic asymmetric Friedel–Craftsalkylation of indoles with nitroalkenes, in which either of the enantiomeric products 2 could be selectively obtained under the suitable reaction conditions (i.e. with or without an added solid support; see scheme).
Asymmetric Alkylation of Anthrones, Enantioselective Total Synthesis of (−)- and (+)-Viridicatumtoxins B and Analogues Thereof: Absolute Configuration and Potent Antibacterial Agents
作者:K. C. Nicolaou、Guodu Liu、Kathryn Beabout、Megan D. McCurry、Yousif Shamoo
DOI:10.1021/jacs.6b12654
日期:2017.3.15
this naturally occurring antibiotic. While the developed asymmetricsynthesis of C10 substituted anthrones is anticipated to find wider applications in organic synthesis, its immediate application to the construction of a variety of designed enantiopureanalogues of viridicatumtoxin B led to the discovery of highly potent, yet simpler analogues of the molecule. These studies are expected to facilitate
描述了使用奎尼丁或奎宁衍生的催化剂相转移催化蒽酮与环状烯丙基溴的不对称烷基化。利用温和的碱性条件和低至 0.5 mol % 的催化剂负载量,并实现高达 > 99:1 dr 的选择性,这种不对称反应成功地应用于对映选择性地产生 (-)- 和 (+)- 绿藻毒素 B,从而允许分配这种天然抗生素的绝对构型。虽然开发的 C10 取代蒽酮的不对称合成有望在有机合成中找到更广泛的应用,但其直接应用于构建各种设计的 viridicatumtoxin B 的对映体纯类似物,导致发现了高效但更简单的分子类似物。
Reversal of Enantioselectivity between the Copper(I)- and Silver(I)-Catalyzed 1,3-Dipolar Cycloaddition Reactions Using a Brucine-Derived Amino Alcohol Ligand
作者:Hun Young Kim、Hui-Ju Shih、William E. Knabe、Kyungsoo Oh
DOI:10.1002/anie.200903479
日期:2009.9.21
The old switcheroo: The switch in the enantioselectivity of a reaction by using a single chiral source has been achieved using different metal binding modes of the chiral aminoalcohol 1 in the presence of CuI and AgI sources. Azomethine ylides were shown to undergo highly enantio‐ and diastereoselective 1,3‐dipolar cycloadditions with substituted tert‐butyl acrylates to provide both of the enantiomerically
Brucine-Derived Amino Alcohol Catalyzed Asymmetric Henry Reaction: An Orthogonal Enantioselectivity Approach
作者:Hun Young Kim、Kyungsoo Oh
DOI:10.1021/ol902380z
日期:2009.12.17
A new approach to both enantioenriched Henry products is developed by use of different molecularities of metal-ligand complexes generated from Cu(I) and Zn(II) metals with readily available chiral amino alcohol 1.