肿瘤块复杂的异质环境通常会导致耐药性并促进化疗不敏感,从而在癌症患者中引发更多的恶性表型。事实证明,主要的 DNA 损伤性癌症药物在提高化疗耐药性方面并不成功。(±)-peharmaline A 是从骆驼蓬种子中分离出来的杂种天然产物,具有显着的细胞毒活性。在此,我们描述了围绕抗癌天然产物 (±)-peharmaline A 的新型紧密和简化类似物库的设计和合成,并研究了它们的细胞毒性活性,从而鉴定了三种结构简化的先导化合物,它们表现出更好的效力比母体天然产物。其中,peharmaline A 的去甲氧基类似物的抗癌潜力被进一步研究,促使去甲氧基类似物作为有效的 DNA 损伤诱导剂,减弱负责 DNA 损伤修复的蛋白质的表达。因此,这种去甲氧基类似物需要进行详细的研究,以确认其抗癌活性的基于分子机制的研究。 __________________________________________
CDI-mediated monoacylation of symmetrical diamines and selective acylation of primary amines of unsymmetrical diamines
作者:Sanjeev K. Verma、Ramarao Ghorpade、Ajay Pratap、M. P. Kaushik
DOI:10.1039/c1gc16314k
日期:——
A highly efficient and green protocol for monoacylation of symmetricaldiamines and chemoselective acylation of primary amines of unsymmetrical diamines has been developed.
Identification of new modulator of DNA repairing pathways based on natural product (±)-peharmaline A
作者:Akshay S. Kulkarni、Anshurekha Dash、Rahul D. Shingare、Jagdish Chand、Diksha Manhas、Aman Singh、Utpal Nandi、Anindya Goswami、D. Srinivasa Reddy
DOI:10.1016/j.bmc.2023.117365
日期:2023.8
(±)-peharmaline A, a hybrid naturalproduct isolated from seeds of Peganum harmala L. possesses significant cytotoxic activities. Herein, we have described the design, and synthesis of a novel library of close and simplifiedanalogues around the anticancer naturalproduct (±)-peharmaline A and investigated their cytotoxic activities, which led to the identification of three structurally simplified lead compounds
肿瘤块复杂的异质环境通常会导致耐药性并促进化疗不敏感,从而在癌症患者中引发更多的恶性表型。事实证明,主要的 DNA 损伤性癌症药物在提高化疗耐药性方面并不成功。(±)-peharmaline A 是从骆驼蓬种子中分离出来的杂种天然产物,具有显着的细胞毒活性。在此,我们描述了围绕抗癌天然产物 (±)-peharmaline A 的新型紧密和简化类似物库的设计和合成,并研究了它们的细胞毒性活性,从而鉴定了三种结构简化的先导化合物,它们表现出更好的效力比母体天然产物。其中,peharmaline A 的去甲氧基类似物的抗癌潜力被进一步研究,促使去甲氧基类似物作为有效的 DNA 损伤诱导剂,减弱负责 DNA 损伤修复的蛋白质的表达。因此,这种去甲氧基类似物需要进行详细的研究,以确认其抗癌活性的基于分子机制的研究。 __________________________________________
Energy-Transfer-Enabled Radical Acylation Using Free Alkyl Boronic Acids through Photo and NHC Dual Catalysis
作者:Wan-Cong Liu、Xiang Zhang、Lin Chen、Rong Zeng、Yuan-Hang Tian、En-Dian Ma、Ya-Peng Wang、Bin Zhang、Jun-Long Li
DOI:10.1021/acscatal.3c06027
日期:2024.3.1
for ketone synthesis. As an important coupling partner, bench-stable and commercially available alkyl boronicacids are widely used in transition metal catalysis, but they are rarely utilized as radical precursors for acylative coupling reactions. Herein, we reported an energy-transfer-enabled radical acylation using free alkyl boronicacids via NHC/photo dual catalysis. This protocol could efficiently
Indium-mediated one-pot synthesis of benzoxazoles or oxazoles from 2-nitrophenols or 1-aryl-2-nitroethanones
作者:Jung June Lee、Jihye Kim、Young Moo Jun、Byung Min Lee、Byeong Hyo Kim
DOI:10.1016/j.tet.2009.08.059
日期:2009.10
One-pot reduction-triggered heterocyclizations from 2-nitrophenols to benzoxazoles and from 1-aryl-2-nitroethanones to oxazoles were investigated. In the presence of indium/AcOH in benzene at reflux, 2-nitrophenols and R-C(OMe)(3) (R=H, Me, Ph) produced excellent yields of corresponding benzoxazoles within an hour. Similarly, 1-aryl-2-nitroethanones and Ph-C(OMe)(3) in the presence of indiurn/AcOH in acetonitrile transformed into the corresponding oxazoles with good yields. (c) 2009 Elsevier Ltd. All rights reserved.
Synthesis of Dithiolethiones and Identification of Potential Neuroprotective Agents via Activation of Nrf2-Driven Antioxidant Enzymes
Oxidative stress is implicated in the pathogenesis of a wide variety of neurodegenerative disorders, and accordingly, dietary supplement of exogenous antioxidants or/and upregulation of the endogenous antioxidant defense system are promising for therapeutic intervention or chemoprevention of neurodegenerative diseases. Nrf2, a master regulator of the cellular antioxidant machinery, cardinally participates in the transcription of cytoprotective genes against oxidative/electrophilic stresses. Herein, we report the synthesis of 59 structurally diverse dithiolethiones and evaluation of their neuroprotection against 6-hydroxydopamine- or H2O2 -induced oxidative damages in PC12 cells, a neuron-like rat pheochromocytoma cell line. Initial screening identified compounds 10 and 11 having low cytotoxicity but conferring remarkable protection on PC12 cells from oxidative-mediated damages. Further studies demonstrated that both compounds upregulated a battery of antioxidant genes as well as corresponding genes' products. Significantly, silence of Nrf2 expression abolishes cytoprotection of 10 and 11, indicating targeting Nrf2 activation is pivotal for their cellular functions. Taken together, the two lead compounds discovered here with potent neuroprotective functions against oxidative stress via Nrf2 activation merit further development as therapeutic or chemopreventive candidates for neurodegenerative disorders.