Carbene-Catalyzed α-Carbon Amination of Chloroaldehydes for Enantioselective Access to Dihydroquinoxaline Derivatives
摘要:
An NHC-catalyzed alpha-carbon amination of chloroaldehydes was developed. Cyclohexadiene-1,2-diimines are used as amination reagents and four-atom synthons. Our reaction affords optically enriched dihydroquinoxalines that are core structures in natural products and synthetic bioactive molecules.
Synthesis and BK channel-opening activity of 2-amino-1,3-thiazole derivatives
作者:Xiao-Lei Qi、Heeji Jo、Xue-Ying Wang、Tong-Tong Ji、Hai-Xia Lin、Chul-Seung Park、Yong-Mei Cui
DOI:10.1016/j.bmcl.2021.128083
日期:2021.7
activities in cell-based fluorescence assay and electrophysiological recording. The assay results indicated that the activities of the investigated compounds were influenced by the physicochemical properties of the substituent at benzenering.
合成了一系列 2-氨基-5-芳基甲基-或 5-杂芳基甲基-1,3-噻唑衍生物,并在基于细胞的荧光测定和电生理记录中评估了 BK 通道开放活动。测定结果表明,所研究化合物的活性受苯环取代基理化性质的影响。
Discovery and Potency Optimization of 2-Amino-5-arylmethyl-1,3-thiazole Derivatives as Potential Therapeutic Agents for Prostate Cancer
作者:Mikhail Krasavin、Ruben Karapetian、Igor Konstantinov、Yuri Gezentsvey、Konstantin Bukhryakov、Elena Godovykh、Olga Soldatkina、Yan Lavrovsky、Andrei V. Sosnov、Andrei A. Gakh
DOI:10.1002/ardp.200800201
日期:2009.7
antiproliferative activity on DU‐145 human prostate carcinoma cell line (hit compound potency – 2.9 μM). Medicinal chemistry optimization of two peripheral diversity vectors of the hit molecule, independently, led to SAR generalizations and identification of the ‘best’ moieties. The latter were merged in a single compound that exhibited an over 100‐fold better potency than the hit compound. For the most potent
通过高通量筛选确定了一个新的化学系列,它对 DU-145 人前列腺癌细胞系具有抗增殖活性(命中化合物效力 - 2.9 μM)。对命中分子的两个外围多样性载体的药物化学优化,独立地导致 SAR 概括和“最佳”部分的鉴定。后者合并为单一化合物,其效力比命中化合物高 100 倍以上。对于最有效的化合物,已证实观察到的抗增殖效力与化合物的非特异性细胞毒性无关。
Carbene Catalyzed Access to 3,6‐Disubstituted
<i>α</i>
‐Pyrones via Michael Addition/Lactonization/Elimination Cascade
metal-free access to 3,6-disubstituted α-pyrones from α-chloro aldehydes and β-tosyl enones is reported. The reactions proceed via the Michael addition/lactonization/elimination cascade. The regioselective addition of NHC-bound enolates/homoenolates to the enones bearing a bulkier functionality such as tosyl group at the β-position has remained challenging. The 3,6-disubstituted α-pyrones could be converted
Carbene and Acid Cooperative Catalytic Reactions of Aldehydes and <i>o</i>-Hydroxybenzhydryl Amines for Highly Enantioselective Access to Dihydrocoumarins
作者:Xingkuan Chen、Runjiang Song、Yingguo Liu、Chong Yih Ooi、Zhichao Jin、Tingshun Zhu、Hongling Wang、Lin Hao、Yonggui Robin Chi
DOI:10.1021/acs.orglett.7b02883
日期:2017.11.3
A highly enantioselective method for quick access to dihydrocoumarins is reported. The reaction involves a cooperative catalytic process with carbene and in situ generated Brønsted acid as the catalysts. α-Chloro aldehyde and readily available and stable o-hydroxybenzhydryl amine substrates were used to generate reactive azolium ester enolate and ortho-quinone methide (o-QM) intermediates, respectively
Carbene‐Catalyzed Direct Functionalization of the β‐sp
<sup>3</sup>
‐Carbon Atoms of α‐Chloroaldehydes
作者:Bin Liu、Guoyong Luo、Hongling Wang、Lin Hao、Song Yang、Zhichao Jin、Yonggui Robin Chi
DOI:10.1002/chem.201903592
日期:2019.10
the β-sp3 carbon atom of α-chloro aldehyde has been developed. The reaction starts with the addition of a carbene catalyst to α-chloroaldehyde to eventually form the homoenolate intermediate. This overall redox-neutral process successfully converts the otherwise inert β-sp3 -carbon atom of the aldehyde substrate to a nucleophilic carbon atom for asymmetric reactions. This study constitutes the first