Nano CoFe<sub>2</sub>O<sub>4</sub> supported antimony(<scp>iii</scp>) as an efficient and recyclable catalyst for one-pot three-component synthesis of multisubstituted pyrroles
A novelmagnetic nano-CoFe2O4 supported Sb ([CoFe2O4@SiO2–DABCO–Sb]) was successfully constructed, which exhibited high catalytic activity for one-potthree-componentsynthesis of multisubstituted pyrroles in the reaction of amines, nitroolefin and 1,3-dicarbonyl compounds. The magneticheterogeneouscatalyst could be easily recovered using an external magnet and reused many times without significant
成功地构建了一种新型的磁性纳米CoFe 2 O 4负载的Sb([CoFe 2 O 4 @SiO 2 –DABCO-Sb]),该催化剂对多取代吡咯的一锅三组分合成具有很高的催化活性。胺,硝基烯烃和1,3-二羰基化合物。磁性非均相催化剂可以使用外部磁体容易地回收,并且可以多次重复使用而不会显着降低催化活性。
DABCO-Promoted One-Pot Facile Synthesis of Angularly Fused Furoquinolinones and Furocoumarins
作者:Monoranjan Ghosh、Alakananda Hajra
DOI:10.1002/ejoc.201501152
日期:2015.12
A DABCO-promoted intermolecular cyclization between enols and nitrostyrenes has been developed for the regioselective synthesis of angularlyfused furan derivatives in high yields. This protocol is applicable to various enol derivatives, including 4-hydroxyquinolinones, 4-hydroxycoumarin, and 4-hydroxypyranone.
An efficient [3+2] cycloaddition for the synthesis of substituted pyrazolo[1,5-c]quinazolines
作者:Tao Wang、Ailong Shao、Haiyan Feng、Shuwu Yang、Meng Gao、Jun Tian、Aiwen Lei
DOI:10.1016/j.tet.2015.03.019
日期:2015.7
and efficient [3+2] cycloaddition reaction between N-iminoquinazolinium ylide and nitroolefins was developed. From a synthetic point of view, this protocol represents an efficient way to pyrazolo[1,5-c]quinazolines derivatives.
开发了N-亚氨基喹唑啉鎓叶立德和硝基烯烃之间简单有效的[3 + 2]环加成反应。从综合的观点来看,该方案代表了吡唑并[1,5- c ]喹唑啉衍生物的有效方法。
Catalyst-Free Synthesis of Benzofuran Derivatives from Cascade Reactions between Nitroepoxides and Salicylaldehydes
作者:Mohammad A. Ranjbari、Hossein Tavakol
DOI:10.1021/acs.joc.1c00143
日期:2021.3.19
Different benzofuran derivatives are synthesized via a catalyst-free reaction between nitroepoxides and salicylaldehydes. In the employed methodology, K2CO3 and DMF have been used at 110 °C, and the reactions were completed after 12 h in 33–84% yields. The highest yields were obtained using 3-nitrosalicylaldehyde. Finally, a plausible mechanism was proposed for the reaction, and some evidence was provided
通过硝基环氧化物和水杨醛之间的无催化剂反应合成不同的苯并呋喃衍生物。在所采用的方法中,已在110°C下使用K 2 CO 3和DMF,反应12小时后以33-84%的收率完成反应。使用3-硝基水杨醛可获得最高的收率。最后,提出了一种可行的反应机理,并为该机理提供了一些证据,例如检测释放的乙酸根阴离子(使用FTIR)以及分离和确定关键中间体的结构。
Synthesis of 2,7,12,17-tetra-arylporphyrins, new sterically hindered porphyrins
Stericallyhinderedporphyrins with four bulky aryl groups in the β-positions are prepared by the reduction of ethyl 3-aryl-4-alkylpyrrole-2-carboxylate with LiAIH4 followed by treatment with an acid and an oxidizing agent.