New Route to the Synthesis of the Isocryptolepine Alkaloid and Its Related Skeletons Using a Modified Pictet-Spengler Reaction
作者:Piyush K. Agarwal、Devesh Sawant、Sunil Sharma、Bijoy Kundu
DOI:10.1002/ejoc.200800929
日期:2009.1
A newroute to the synthesis of the isocryptolepine alkaloid with antimalarial activity using a modified Pictet–Spengler reaction has been devised. The strategy was then used to generate libraries based on three structural variants of the alkaloid. Compounds based on these three variants in general were accessed in three steps through a modified Pictet–Spengler cyclization reaction as the key step
Synthesis and antifungal activities of novel 5,6-dihydro-indolo[1,2-a]quinoxaline derivatives
作者:Hui Xu、Ling-ling Fan
DOI:10.1016/j.ejmech.2011.02.035
日期:2011.5
A series of new 5,6-dihydro-indolo[1,2-a]quinoxaline derivatives has been prepared in moderate to excellent yields from 2-(indol-1-yl)phenylamines with aromatic aldehydes by an efficient and economical iron-catalyzed Pictet-Spengler reaction. Meanwhile, as compared with hymexazol, a commercially available agricultural fungicide at the concentration of 50 mu g/mL, some 5,6-dihydro-indolo[1,2-a]quinoxalines exhibited promising antifungal activities in vitro against the phytopathogenic fungi, and might be considered as novel promising lead candidates for further design and synthesis of agricultural fungicides. (C) 2011 Elsevier Masson SAS. All rights reserved.
Fe 3 O 4 @SiO 2 –imid–PMA n magnetic porous nanosphere as recyclable catalyst for the green synthesis of quinoxaline derivatives at room temperature and study of their antifungal activities
作者:Jaber Javidi、Mohsen Esmaeilpour
DOI:10.1016/j.materresbull.2015.10.002
日期:2016.1
Abstract An efficient, simple, and green procedure for the synthesis of quinoxaline derivatives catalyzed by Fe3O 4 @SiO 2 –imid–PMA n nanoparticles at room temperature is described. This environmentally benign method provides several advantages such as mild reaction conditions, good to excellent yields, short reaction times, simple work-up and catalyst stability, easy preparation, heterogeneous nature
摘要描述了一种在室温下由 Fe 3 O 4 @SiO 2 -imid-PMA n 纳米颗粒催化合成喹喔啉衍生物的高效、简单和绿色的方法。这种环境友好的方法具有多种优点,例如反应条件温和、产率高、反应时间短、后处理简单、催化剂稳定性好、易于制备、多相性质和催化剂易于分离。此外,纳米催化剂可以很容易地通过磁场回收并在接下来的反应中重复使用至少 6 次,而不会明显降低催化活性。研究了每个反应循环后的 SEM、BET、DLS 和催化剂浸出情况。此外,各种衍生物对三种植物病原真菌(Alternaria alternata、Pyricularia oryzae、