在这项研究中,使用原子吸收,电感耦合等离子体发射光谱,元素分析,热重分析,傅里叶变换红外光谱,扫描电子显微镜,能量分散法制备并表征了二氧化硅包覆的Fe 3 O 4纳米@甲硅烷基丙基三乙铵多金属氧酸盐催化剂。 X射线光谱学和振动样品磁力分析。在合成四氢苯并咪唑并[ 2,1– b ]喹唑啉-1(2 H)-那些。在该合成中,多金属氧酸盐与纳米颗粒表面的结合表现出优异的催化活性。此外,该催化剂显示出良好的可重复使用性和从反应混合物中的回收率。在传统的加热条件下,在廉价的负载型固体酸催化剂存在下,高收率合成了四氢苯并咪唑并[ 2,1– b ]喹唑啉-1(2 H)-1 。
Facile DES-mediated synthesis and antioxidant potency of benzimidazoquinazolinone motifs
作者:Vilas N. Mahire、Vijay E. Patel、Pramod P. Mahulikar
DOI:10.1007/s11164-016-2734-1
日期:2017.3
One-pot multicomponent synthesis of benzimidazoquinazolinone scaffolds was achieved by reaction between 2-aminobenzimidazole, aldehyde, and 1,3-cyclohexadione in choline chloride:glycerol as deep eutectic solvent (DES). The developed methodology offers mild and faster reaction conditions with excellent product yield. The synthesized compounds were screened for their antioxidant potency using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, ferric reducing antioxidant power (FRAP), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and metal chelating assay. Most of the compounds were found to exhibit good to comparable antioxidant activity with respect to standards. Use of this inexpensive and biodegradable solvent makes this methodology a greener approach compared with other methods reported in literature. Greener, one-pot multicomponent synthesis of benzimidazoquinazolinone scaffolds using DES (ChCl:glycerol) as efficient, recyclable, and biodegradable solvent has been achieved. The synthesized compounds show good to comparable antioxidant activity compared with standards.
Green and high efficient synthesis of triaza‐benzo[
<i>b</i>
]fluoren‐6‐one derivatives in water under microwave irradiation
作者:Qingqing Shao、Shujiang Tu、Chunmei Li、Longji Cao、Dianxiang Zhou、Bo Jiang、Yan Zhang、Wenjuan Hao、Qian Wang
DOI:10.1002/jhet.5570450218
日期:2008.3
Triaza-benzo[b]fluoren-6-one derivatives were synthesized via the three-component reaction of aldehyde, cyclohexane-1,3-dione compound and 2-aminobenzimidazole in waterundermicrowaveirradiation. The new protocol has the advantages of excellent yield, low cost, reduced environment impact, wide scope and convenient procedure.
在微波辐射下,通过醛,环己烷-1,3-二酮化合物和2-氨基苯并咪唑的三组分反应合成了三氮杂苯并[ b ]芴-6-一衍生物。新协议具有产量高,成本低,对环境影响小,适用范围广,操作方便等优点。
A new type of SO<sub>3</sub>H-functionalized magnetic-titania as a robust magnetically-recoverable solid acid nanocatalyst for multi-component reactions
作者:Elham Tabrizian、Ali Amoozadeh
DOI:10.1039/c6ra21048a
日期:——
the nanocatalyst was assessed for the synthesis of benzimidazoquinazolinones and polyhydroquinolines, in which the reaction conditions were optimized by applying central composite design (CCD) through response surface methodology. The nanocatalyst could be separated from the reaction mixture easily by magnetic decantation and reused at least six times without a noticeable degradation in catalytic activity
通过两步法合成了SO 3 H-官能化的磁性二氧化钛纳米颗粒(Fe 3 O 4 @ TDI @ TiO 2 -SO 3 H),包括将n-TiO 2共价接枝到n-Fe 3 O 4上。 通过2,4-甲苯二异氰酸酯作为区域选择性连接基(n-Fe 3 O 4 @ TDI @ TiO 2),然后使用氯磺酸进行磺化。制备的纳米催化剂的特征在于傅立叶变换红外光谱(FT-IR),热重分析(TGA),X射线衍射(XRD),场发射扫描电子显微镜(FE-SEM)和振动样品磁力法(VSM)。评估了纳米催化剂的催化活性,用于合成苯并咪唑并喹唑啉酮和聚氢喹啉,其中通过采用响应表面方法应用中心复合设计(CCD)优化了反应条件。可以通过磁倾析法容易地将纳米催化剂从反应混合物中分离出来,并重复使用至少六次,而催化活性没有明显降低。据我们所知,
Synthesis and characterization of silica‐coated Fe
<sub>3</sub>
O
<sub>4</sub>
nanoparticle@silylpropyl triethylammonium polyoxometalate as an organic–inorganic hybrid heterogeneous catalyst for the one‐pot synthesis of tetrahydrobenzimidazo[2,1‐
<i>b</i>
]quinazolin‐1(2
<i>H</i>
)‐ones
作者:Alkassoume Moussa、Abbas Rahmati
DOI:10.1002/aoc.5894
日期:2020.11
was examined in the synthesis of tetrahydrobenzimidazo[2,1‐b]quinazolin‐1(2H)‐ones. The bonding of the polyoxometalate to the surface of the nanoparticles exhibited excellent catalytic activity in this synthesis. Besides, the catalyst showed good reusability and recovery from the reaction mixture. Tetrahydrobenzimidazo[2,1‐b]quinazolin‐1(2H)‐ones were synthesized in high yields in the presence of inexpensive
在这项研究中,使用原子吸收,电感耦合等离子体发射光谱,元素分析,热重分析,傅里叶变换红外光谱,扫描电子显微镜,能量分散法制备并表征了二氧化硅包覆的Fe 3 O 4纳米@甲硅烷基丙基三乙铵多金属氧酸盐催化剂。 X射线光谱学和振动样品磁力分析。在合成四氢苯并咪唑并[ 2,1– b ]喹唑啉-1(2 H)-那些。在该合成中,多金属氧酸盐与纳米颗粒表面的结合表现出优异的催化活性。此外,该催化剂显示出良好的可重复使用性和从反应混合物中的回收率。在传统的加热条件下,在廉价的负载型固体酸催化剂存在下,高收率合成了四氢苯并咪唑并[ 2,1– b ]喹唑啉-1(2 H)-1 。