Synthesis of functionalized chromene and spirochromenes using l -proline-melamine as highly efficient and recyclable homogeneous catalyst at room temperature
commercially cheap l-proline and melamine for the synthesis of chromenes and spirochromenes (spirooxindoles) via multicomponent reactions at room temperature. Systematic studies were conducted in order to achieve desired reactivity and recyclability of the catalyst using various α-amino acids and aromatic amines as donor-acceptor pairs. Among the screened combinations, l-proline and melamine (3:1 ratio;
Polyethylene glycol-bonded 1,8-diazabicyclo[5.4.0]undec-7-ene (PEG–DBU) as a surfactant-combined base catalyst for the application of nucleosides as reagents in multi-component syntheses of 8-substituted pyrido[2,3-d]pyrimidine-6-carbonitriles in water
作者:Mohsen Shekouhy、Ali Khalafi-Nezhad
DOI:10.1039/c5gc01448d
日期:——
PEG–DBU: a surfactant-combined base catalyst for the synthesis of 8-substituted pyrido[2,3-d]pyrimidine-6-carbonitriles in water.
PEG-DBU:一种在水中合成8-取代吡啶并[2,3-d]嘧啶-6-碳腈的表面活性剂结合碱催化剂。
Microwave‐assisted synthesis and antimicrobial activity of novel spiro 1,3,4‐thiadiazolines from isatin derivatives
This work describes the synthesis of spiro 1,3,4‐thiadiazolines from isatin‐β‐thiosemicarbazone acetylation, using microwave irradiation as a source of heating the reaction medium. N‐substituted isatin derivatives were used as substrates to obtain thiosemicarbazones by adding thiosemicarbazide to the isatin ketone carbonyl. The final synthetic step was the reaction of thiosemicarbazones with acetic
Hantzsch reaction with <i>bis</i>-indole-2,3-diones: Synthesis of novel <i>bis</i>-spirocyclic oxindole incorporating acridine, dipyrazolo[3,4-<i>b</i>:4',3'-<i>e</i>]pyridine and pyrido[2,3-<i>d</i>:6,5-<i>d'</i>]dipyrimidine
作者:Amr M. Abdelmoniem、Mohamed G. M. Abdelrahman、Said A. S. Ghozlan、Ahmed H. M. Elwahy、Ismail A. Abdelhamid
DOI:10.1080/00397911.2021.1908564
日期:2021.6.18
reaction of bis(indole-2,3-diones) with dimedone, 3-methyl-1H-pyrazol-5(4H)-one, or 6-aminouracil in boiling acetic acid afforded bis-spirocyclic oxindoles linked to acridine, dipyrazolo[3,4-b:4',3'-e]pyridine, and pyrido[2,3-d:6,5-d']dipyrimidine, respectively.
摘要 在沸腾的乙酸中,双(吲哚-2,3-二酮)与二甲酮,3-甲基-1 H-吡唑-5(4 H)-一或6-氨基尿嘧啶的一锅三组分环缩合反应得到分别与a啶,双吡唑并[3,4- b:4',3'- e ]吡啶和吡啶并[2,3- d:6,5- d ']双嘧啶连接的双-螺环羟吲哚。
Highly efficient, one-pot synthesis of novel bis-spirooxindoles with skeletal diversity via sequential multi-component reaction in PEG-400 as a biodegradable solvent
A green and efficient one-pot, sequential, multi-component protocol has been developed for the synthesis of some novel symmetrical bis-spirooxindole derivatives from the reaction of isatins, dihalides, malono derivatives and C–H activated carbonylcompounds or ketene aminal derivatives in the presence of potassium carbonate (K2CO3) in polyethylene glycol 400 (PEG-400) as a biodegradable polymeric solvent
已开发出一种绿色高效的一锅,顺序,多组分方案,该方案用于从靛红,二卤化物,丙二酸衍生物和CH活化的羰基化合物或乙烯酮缩醛衍生物反应中合成一些新颖的对称双螺氧并吲哚衍生物。在室温下,聚乙二醇400(PEG-400)中存在碳酸钾(K 2 CO 3)作为可生物降解的聚合物溶剂。在这项研究中,各种双螺吲哚并吡喃并吡喃,双螺吲哚并苯并吡喃,双螺吲哚并吡啶并嘧啶,双螺吲哚并咪唑并吡啶和双螺吲哚并吡啶。在较短的反应时间内以优异的收率获得了目标化合物,无需进行色谱分离。