Magnetically recyclable CuFe2O4 catalyst for efficient synthesis of bis(indolyl)methanes using indoles and alcohols under mild condition
作者:Ngoc-Khanh Nguyen、Minh-Tuan Ha、Hoang Yen Bui、Quang Thang Trinh、Bich Ngoc Tran、Van Tuyen Nguyen、Tran Quang Hung、Tuan Thanh Dang、Xuan Hoan Vu
DOI:10.1016/j.catcom.2020.106240
日期:2021.1
Bis(3-indolyl)methanes (BIM) are highly valuable and appear in the core structure of many natural products and pharmacologically active compounds (anticancer, anti-inflammatory, antiobesity, antimetastatic, antimicrobial, etc.). Herein, we have disclosed an air stable and highly efficient CuFe2O4 heterogeneous catalyst for alkylation of indoles with alcohols to give bis(3-indolyl)methanes in very good
双(3-吲哚基)甲烷(BIM)具有很高的价值,并出现在许多天然产物和药理活性化合物(抗癌,抗炎,抗肥胖,抗肿瘤,抗微生物等)的核心结构中。在此,我们已经公开了一种空气稳定且高效的CuFe 2 O 4非均相催化剂,用于用醇将吲哚烷基化以非常好的收率得到双(3-吲哚基)甲烷。已经发现CuFe 2 O 4催化剂被磁循环至少五次而不会损失明显的催化活性。
The chemistry of coumarin derivatives. Part 3. Synthesis of 3-alkyl-4-hydroxycoumarins by reductive fragmentation of 3,3?-alkyiidene-4,4?-dihydroxybis[coumarins]
作者:Giovanni Appendino、Giancarlo Cravotto、Silvia Tagliapietra、Stefano Ferraro、Gian Mario Nano、Giovanni Palmisano
DOI:10.1002/hlca.19910740708
日期:1991.10.30
Treatment of 3,3′-alkylidene-4,4′-dihydroxybis[coumarins] 1 with NaBH3CN in refluxing MeOH affords 3-alkyl-4-hydroxycoumarins 2 and 4-hydroxycoumarin (3; Scheme 1). The reaction might take place via hydride trapping of alkylidenechromandiones C formed from 1 in a retro-Michael reaction. Such a retro-Michael reaction of 1 might be biologically relevant. The presence of C during the reductive fragmentation
A new organocatalytic procedure for the synthesis of bis(indolyl)methanes with acidic ionic liquid immobilized on silica gel (ILIS-SO2Cl) has been developed. The reaction condition is applicable to a variety of aryl and aliphatic aldehydes and indoles. The mild nature of the reaction conditions showed that the acetoxy or TBDMS group in the aldehyde was maintained intact. The catalyst was reused four times in 93% average yield.
A series of aza-crown ether ionic liquids supported on magnetic Fe3O4@SiO2 core–shell particles were designed, synthesized and characterized by elemental analysis, TEM, TG and FT-IR. These new aza-crown ether complex cation ionic liquids were utilized as heterogeneous acidic catalysts in Friedel–Crafts alkylation and Hantzsch reaction in good yields under convenient reaction conditions. Moreover, these
设计,合成并通过元素分析,TEM,TG和FT-IR表征了在磁性Fe 3 O 4 @SiO 2核-壳颗粒上负载的一系列氮杂-冠醚离子液体。这些新型的氮杂-冠醚络合物阳离子离子液体在便利的反应条件下,以良好的收率被用作Friedel-Crafts烷基化和Hantzsch反应中的多相酸性催化剂。而且,这些磁性颗粒负载的IL催化剂可以容易地通过外部磁体回收并重复使用五次而没有明显的活性损失。
Nano n-propylsulfonated γ-Fe2O3 (NPS-γ-Fe2O3) as a magnetically recyclable heterogeneous catalyst for the efficient synthesis of 2-indolyl-1-nitroalkanes and bis(indolyl)methanes
作者:Sara Sobhani、Roya Jahanshahi
DOI:10.1039/c3nj40899j
日期:——
Nano n-propylsulfonated γ-Fe2O3 (NPS-γ-Fe2O3) was used as a new magnetically recyclable heterogeneous catalyst for the efficient synthesis of indole derivatives, such as 2-indolyl-1-nitroalkanes and bis(indolyl)methanes.