Synthesis of chiral α-amino anilides via a DMEDA-promoted selective C─N coupling reaction of aryl halides and α-aminoamides
作者:Xiangting Min、Xiaoyu Li、Yu Wang、Yawen Dong、Jingjing Tang、Jing Wang、Jianhui Liu
DOI:10.1016/j.tet.2018.03.003
日期:2018.5
A DMEDA-promoted and copper-catalyzed approach has been designed for the coupling of arylhalides and chiral α-aminoamides to afford a range of functionalized chiral α-amino anilides. This method has a higher yield and better reproducibility than those under ligand-free conditions. Of the two amino groups in the same molecule, only the amide NH2 is observed to react, showing high regioselectivity.
chiral discriminating results towards most amides with two stereogenic centers, which have been rarely studied as chiral substrates by 1HNMRspectroscopy. In particular, CSAs 7, 8 and 9, featuring 3,5-bis(trifluoromethyl)benzene residues, exhibit outstanding chiral discriminating capabilities towards all amides, providing well-separated 1HNMR signals and sufficiently large nonequivalent chemical shifts
一些含有两个立体中心的新型酰胺的对映体衍生自D-和L -α-氨基酸作为客体,通过1 H NMR 光谱进行手性识别。催化不对称合成产物、天然产物或其全合成产物、手性药物中常存在多种具有两个或多个立体中心的手性酰胺。探索它们的手性识别将是一项具有挑战性且有意义的工作。为此,由(1 S ,2 S )-(+)-1,2-二氨基环己烷、 D -α-氨基酸和异硫氰酸酯作为手性溶剂合成了一类新型手性双硫脲衍生物1-9 (国家安全局)。事实证明,CSAs 1-9对大多数具有两个立构中心的酰胺具有更好的手性辨别结果,而这些酰胺很少作为手性底物通过1 H NMR 光谱进行研究。特别是,具有 3,5-双(三氟甲基)苯残基的 CSA 7 、 8和9 ,对所有酰胺表现出出色的手性辨别能力,提供良好分离的1 H NMR 信号和足够大的非等价化学位移。为了测试它们在测定对映体过量方面的实际应用,分别在 CSA 7和8存在下测量了不同光学纯度的手性酰胺
Discovery of meta-sulfamoyl N-hydroxybenzamides as HDAC8 selective inhibitors
作者:Chunlong Zhao、Jie Zang、Qin'ge Ding、Elizabeth S. Inks、Wenfang Xu、C. James Chou、Yingjie Zhang
DOI:10.1016/j.ejmech.2018.03.002
日期:2018.4
research and development of histone deacetylase (HDAC) inhibitors as therapeutic agents have achieved great accomplishments, especially in oncology field, there is still an urgent need for the discovery of isoform-selective HDACinhibitors considering the side effects caused by nonselective HDACinhibitors. HDAC8, a unique class I zinc-dependent HDAC, is becoming a potential target in cancer and other
The amidated peptides are an important class of biologically active compounds due to their unique biological properties and wide applications as potential peptide drugs and biomarkers. Despite the abundance of free amide motifs (Asn, Gln, and C-terminal amide) in native peptides, late-stage modification of the amide unit in naturally occurring peptides remains very rare because of the intrinsically
酰胺化肽因其独特的生物学特性和作为潜在肽药物和生物标志物的广泛应用而成为一类重要的生物活性化合物。尽管天然肽中含有丰富的游离酰胺基序(Asn、Gln 和 C 端酰胺),但天然肽中酰胺单元的后期修饰仍然非常罕见,因为酰胺本身亲核性较弱,并且存在多个竞争性亲核残基的干扰,通常会导致不希望的副反应。在此,已在空气气氛下开发了未受保护的多肽中酰胺的化学选择性芳基化,以提供N-带有各种功能基序的芳基酰胺肽。它的成功依赖于金催化和银盐的结合,以区分一系列反应性亲核氨基酸残基(例如,-NH 2、-OH和-COOH)中相对惰性的酰胺,有利于C-N键偶联酰胺优于其他亲核基团。实验和 DFT 研究揭示了银阳离子的关键作用,它充当更具反应性的反应位点的瞬时配位掩模,克服了酰胺固有的低反应性。该策略优异的生物相容性已应用于多种肽药物和复合肽的功能化。该应用可以进一步扩展到肽标记和肽装订。