synthesized from betulinic acid by its oxidation to 30-oxobetulinic acid followed by the Wittig reaction. Cytotoxicity of all compounds was tested in vitro in eight cancer cell lines and two noncancer fibroblasts. Almost all dienes were more cytotoxic than betulinic acid. Compounds 4.22, 4.30, 4.33, 4.39 had IC50 below 5 μmol/L; 4.22 and 4.39 were selected for studies of the mechanism of action. Cell cycle
通过将桦木酸氧化为 30-氧代桦木酸,然后进行 Wittig 反应,合成了一组新的取代二烯。在八种癌细胞系和两种非癌成纤维细胞中体外测试了所有化合物的细胞毒性。几乎所有的二烯都比桦木酸更具细胞毒性。化合物4.22、4.30、4.33、4.39的IC 50低于5 μmol / L ;选择4.22和4.39进行作用机制研究。细胞周期分析显示在 5 × IC 50时凋亡细胞数量增加浓度,其中可以预期导致细胞死亡的不可逆变化的激活。既4.22和4.39导致细胞在用DNA / RNA合成的部分抑制的G0 / G1期的累积为1×IC 50,并在5几乎完全抑制×IC 50。有趣的是,化合物4.39 在 5 × IC 50导致细胞在 S 期积累。较高浓度的受试药物可能比较低浓度抑制更多的脱靶。破坏细胞代谢的机制可以诱导细胞在 S 期的积累。化合物4.22和4.39 均在癌细胞中引发选择性凋亡通过内在途径,
Electrophilic reaction of nitric oxide with Wittig reagents
作者:Zhongquan Liu、Bo Zhou、Zhongli Liu、Longmin Wu
DOI:10.1016/j.tetlet.2004.12.087
日期:2005.2
Reaction of nitric oxide (NO) with p-substituted benzyl triphenylphosphonium chlorides or bromides (Wittig reagents) in CH2Cl2 under argon undergoes electrophilic attack of NO on the carbon center of phosphonium ylides, producing benzonitriles.
Synthesis and Anti-inflammatory Activity of Phenylbutenoid Dimer Analogs
作者:Sung-Soo Kim、Yuanying Fang、Haeil Park
DOI:10.1002/bkcs.10321
日期:2015.6
Several phenylbutenoiddimer (PBD) analogs were synthesized and evaluated for their inhibitory activities against nitric oxide (NO) production and TNF‐α release. The PBD analogs were synthesized via Diels–Alder and subsequent Schlosser reactions as key steps. Among the tested compounds, two analogs (8c, 8f) exhibited much stronger inhibitory activity against LPS‐stimulated NO production and TNF‐α release
Continuous flow photocyclization of stilbenes – scalable synthesis of functionalized phenanthrenes and helicenes
作者:Quentin Lefebvre、Marc Jentsch、Magnus Rueping
DOI:10.3762/bjoc.9.221
日期:——
A continuous flow oxidative photocyclization of stilbenederivatives has been developed which allows the scalable synthesis of backbone functionalized phenanthrenes and helicenes of various sizes in good yields.
Synthesis of 2-phenylnaphthalenes from styryl-2-methoxybenzenes
作者:Ramesh Mudududdla、Rohit Sharma、Sheenu Abbat、Prasad V. Bharatam、Ram A. Vishwakarma、Sandip B. Bharate
DOI:10.1039/c4cc05151c
日期:——
A new simple and efficient method for the synthesis of 2-phenylnaphthalenes from electron-rich 1-styryl-2-methoxybenzenes has been described. The reaction proceeds via TFA catalyzed C-C bond cleavage followed by intermolecular [4+2]-Diels-Alder cycloaddition of an in situ formed styrenyl trifluoroacetate intermediate. The quantum chemical calculations identified the transition state for the cycloaddition