medicinal agents and bioactive alkaloids. Herein we report a broadly applicable synthesis of enantioenriched NH lactams through a one-pot asymmetric reductive amination/cyclization sequence of easily available keto acids/esters. Such cascade processes alleviate the demand for protecting group manipulations as well as intermediate purification. This strategy is capable of constructing enantioenriched lactams
Catalytic Enantioselective Synthesis of Mariline A and Related Isoindolinones through a Biomimetic Approach
作者:Chang Min、Yingfu Lin、Daniel Seidel
DOI:10.1002/anie.201709182
日期:2017.11.27
The catalytic enantioselective synthesis of isoindolinones was achieved through the condensation of 2‐acyl‐benzaldehydes and anilines. In the presence of 1 mol % of a chiral phosphoric acid catalyst, reactions reach completion within 10 min and provide products with up to 98 % ee. Anilines with an ortho t‐butyl group form atropisomeric products, thereby enabling the simultaneous generation of axial
Phthalides by Rhodium-Catalyzed Ketone Hydroacylation
作者:Diem H. T. Phan、Byoungmoo Kim、Vy M. Dong
DOI:10.1021/ja907711a
日期:2009.11.4
phthalides by using enantioselective ketone hydroacylation. In the presence of Rh[(Duanphos)]X (X = NO(3), OTf, OMs), various 2-ketobenzaldehydes undergo intramolecularhydroacylation to produce phthalide products in good yields and 92-98% ee's. Our study highlights the key role counterions play in controlling both reactivity and enantioselectivity. A concise asymmetric total synthesis of the celery extract
Synthesis of 3,3′‐Disubstituted Isobenzofuran‐1(3
<i>H</i>
)‐Ones via Cs
<sub>0.5</sub>
H
<sub>2.5</sub>
PW
<sub>12</sub>
O
<sub>40</sub>
‐Catalyzed Difunctionalization of Carbonyls
作者:Yu‐Feng Liu、Gang‐Ming Cao、Lei Chen、Ke Li、Xiao‐Ling Lin、Xin‐Xin Xu、Zhang‐Gao Le、Guo‐Ping Yang
DOI:10.1002/adsc.202200081
日期:2022.4.12
We reported a method for the synthesis of 3,3′-disubstituted isobenzofuran-1(3H)-ones via the carbonyl difunctionalization of 2-acylbenzoic acids. A range of nucleophiles was reacted with 2-acylbenzoic acids to furnish the functionalized isobenzofuran-1(3H)-ones with the factual yield range of 61–96%. The reaction uses Cs0.5H2.5PW12O40 as a catalyst and produces water as the sole by-product. Various
我们报道了一种通过2-酰基苯甲酸的羰基双官能化合成 3,3'-二取代异苯并呋喃-1(3 H )-酮的方法。一系列亲核试剂与 2-酰基苯甲酸反应以提供功能化的异苯并呋喃-1(3 H )-酮,实际产率范围为 61-96%。该反应使用 Cs 0.5 H 2.5 PW 12 O 40作为催化剂并产生水作为唯一的副产物。各种官能团可以通过以下方式引入到 isobenzofuran-1(3 H ) -one 骨架C-P/C-N/C-O/C-C 键的形成,这将为合成潜在的生物活性分子提供机会。在初步实验的基础上,提出了一种合理的机制。
Enantioselective Synthesis of 6,6-Disubstituted Pentafulvenes Containing a Chiral Pendant Hydroxy Group
作者:Ryan Nouch、Melchior Cini、Marc Magre、Mohammed Abid、Montserrat Diéguez、Oscar Pàmies、Simon Woodward、William Lewis
DOI:10.1002/chem.201704247
日期:2017.12.6
Simple enantioselective synthesis of 6,6‐disubstituted pentafulvenes bearing chiral pendant hydroxy groups are attained by cascade reactivity using commercially available proline‐based organocatalysts. Condensation of cyclopentadiene with the acetyl function of a 1,2‐formylacetophenone, followed by cyclization of a resulting fulvene‐stabilized carbanion with the formyl group, generates bicyclic chiral