A synthetic route to chiral C(3)-functionalized phthalides via a Ag(I)-catalyzed allylation/transesterification sequence
摘要:
A Ag(I)-catalyzed synthesis of chiral C-(3)-substituted phthalides (8a-f) via a Sakurai-Hosomi allylation/transesterification reaction is described (ee <= 86%). A notable feature of this reaction is that it utilizes ortho-substituted aldehydes, which are a class of compounds that generally afford poor levels of stereoinduction when applying most known catalytic asymmetric allylation approaches. It was also found that elongation of the n-alkyl chain length (R-1, up to n=6; R-2=H) of the starting alkyl 2-formylbenzoates (7g-i) improved the enantiomeric excess (ee) of the product. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
Synthesis of Chiral 3-Substituted Phthalides by a Sequential Organocatalytic Enantioselective Aldol-Lactonization Reaction. Three-Step Synthesis of (<i>S</i>)-(−)-3-Butylphthalide
作者:Haoyi Zhang、Shilei Zhang、Lu Liu、Guangshun Luo、Wenhu Duan、Wei Wang
DOI:10.1021/jo902118x
日期:2010.1.15
enantioenriched “privileged” scaffold. As a result of the sensitive nature of substrate structures of an organocatalytic enantioselective aldol reaction, after extensive optimization of reaction conditions, catalyst l-prolinamide alcohol IV is identified as the best promoter. Interestingly, it is found that in this reaction, addition of an acid additive PhCO2H can significantly enhance reaction efficiency with
易于构建重要分子框架的有效方法的开发是有机合成的重要目标。手性3-取代的邻苯二甲酸酯广泛分布在大量具有广泛,有效和潜在发展前景的生物活性的天然产物中。在这项研究中,我们发现了2-甲酰基苯甲酸酯与酮/醛的前所未有的有机催化不对称醛醇内酯化反应,可方便地构建对映体富集的“特权”支架。由于有机催化对映选择性醛醇缩合反应的底物结构的敏感性质,在广泛优化反应条件后,催化剂1-脯氨酰胺醇IV被确定为最佳启动子。有趣的是,发现在该反应中,添加酸添加剂PhCO 2 H可以显着提高反应效率,而该方法仅使用低至2.5mol%的IV。此外,由于反应条件对顺序的羟醛-内酯化过程敏感,而又不影响对映选择性和外消旋作用,因此在存在K 2 CO 3的情况下,必须除去催化剂以用于随后的容易的内酯化反应。醛醇内酯化方法是制备具有高对映选择性的合成上和生物学上重要的3-取代的邻苯二甲酸酯的有力方法。报道了3-丁基邻苯二甲酸酯的天然产物的三步催化不对称合成。
Synthesis of 3-Benzylphthalide Derivatives by Using a TDAE
Strategy
作者:Patrice Vanelle、Maroua Ibrahimi、Omar Khoumeri、Raoudha Abderrahim、Thierry Terme
DOI:10.1055/a-1290-8349
日期:2021.2
A one-pot synthesis of new 3-benzylphthalide derivatives was developed by using a strategy based on tetrakis(dimethylamino)ethylene (TDAE). The reactions in the presence of TDAE of substituted benzyl chlorides with methyl 2-formylbenzoate or of substituted methyl-2-formylbenzoates with 4-nitrobenzyl chloride furnished the corresponding isobenzofuran-1(3H)-one products in moderate to good yields.
A Brønsted acid-catalyzed thioacid addition to <i>in situ</i>-generated aldimine for the synthesis of isoindolinones with the <i>N</i>,<i>S</i>-acetal framework
作者:Milon M. Sadhu、Chhavi Khajuria、Vinod K. Singh
DOI:10.1039/d2ob01532c
日期:——
A facile methodology was demonstrated for the synthesis of isoindolinones containing the N,S-acetal framework by employing a Brønsted acid catalyst with a three-component reaction. The reaction proceeded via the addition of thioacid to in situ-generated aldimine followed by lactamization, which involved the formation of one C–S bond and two C–N bonds under easily controlled and ambient reaction conditions
An Indium-Mediated Allylative/Transesterification DFT-Directed Approach to Chiral C<sub>(3)</sub>-Functionalized Phthalides
作者:Roya Mirabdolbaghi、Travis Dudding
DOI:10.1021/ol301566f
日期:2012.7.20
A one-pot synthesis of chiral C-(3)-substituted phthalides via an indium-mediated allylation/transesterification reaction is described. The development of this reaction was facilitated through the applied use of DFT calculations to rationalize the stereoselection of a chiral In-mediated process. It was discovered that the enantiomeric excess of this reaction depended upon the steric size, chain length, and substitution of the aldehyde employed.
ORGANIC ELECTROLUMESCENCE DEVICE
申请人:HOSOKAWA Chishio
公开号:US20100160687A1
公开(公告)日:2010-06-24
Materials for organic electroluminescence devices are represented by following general formula [1]:
wherein A represents a chrysene group, X
1
to X
4
each independently represent a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, X
1
and X
2
may be bonded to each other, X
3
and X
4
may be bonded to each other, Y
1
to Y
4
each independently represent an organic group represented by general formula [2], a to d each represent an integer of 0 to 2 and, a+b+c+d≧0;
general formula [2] being:
wherein R
1
to R
4
each independently represent hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, cyano group or form a triple bond by a linkage of R
1
and R
2
or R
3
and R
4
, Z represents a substituted or unsubstituted aryl group having 6 to 20 carbon atoms and n represents 0 or 1.