An affordable DABCO-based ionic liquid efficiency in the synthesis of 3-amino-1-aryl-1H-benzo[f] chromene-2-carbonitrile, 1-(benzothiazolylamino)phenylmethyl-2-naphthol, and 1-(benzoimidazolylamino)phenylmethyl-2-naphthol derivatives
the synthesis of 3-amino-1-aryl-1H-benzo[f]chromene-2-carbonitrile, 1-(benzothiazolylamino)phenylmethyl-2-naphthol, and 1-(benzoimidazolylamino)phenylmethyl-2-naphthol derivatives. In the presence of this catalyst, all reactions are performed under neat conditions during short reaction times in good-to-high yields. Ease of preparation and recyclability of the catalyst are the other important advantages
在这项研究中,[H 2 -DABCO] [HSO 4 ] 2用作酸性离子液体,以消除先前报道的用于合成3-氨基-1-芳基-1 H-苯并[ f ]色烯的方法的缺点。-2-腈,1-(苯并噻唑基氨基)苯基甲基-2-萘酚和1-(苯并咪唑基氨基)苯基甲基-2-萘酚衍生物。在这种催化剂的存在下,所有反应均在纯净条件下,短时间内以高至高收率进行。易于制备和催化剂的可回收性是该方法的另一个重要优点。
An Efficient One-Pot Synthesis of Substituted 1H-Naphtho[2,1-b]pyrans and 4H-1-Benzopyrans (=Chromenes) under Solvent-Free Microwave-Irradiation Conditions
heterogeneous synthesis of 3‐amino‐1‐aryl‐1H‐naphtho[2,1‐b]pyran and 2‐amino‐4‐aryl‐4H‐1‐benzopyran derivatives 3 and 5, respectively, was carried out efficiently by one‐pot three‐component coupling of an aromatic aldehyde 1, an active methylene compound 2, and naphthalen‐2‐ol or a phenol 4 in the presence of 5‐Å molecular sieves under solvent‐free microwave‐irradiation conditions (Scheme 1 and 2, Tables 1
3-氨基-1-芳基- 1的一种简便多相合成ħ -萘并[2,1- b ]吡喃和2-氨基-4-芳基-4- ħ -1-苯并吡喃衍生物3和5,分别进行在无溶剂微波辐射条件下,在5Å分子筛的存在下,通过芳族醛1,活性亚甲基化合物2和萘-2-醇或苯酚4的单锅三组分偶联有效地进行(方案1和2,表1和2)。回收催化剂并再循环(表3)。
Synthesis and characterization of a novel Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–BenzIm-Fc[Cl]/BiOCl nano-composite and its efficient catalytic activity in the ultrasound-assisted synthesis of diverse chromene analogs
ultrasound-assisted synthesis protocol that was studied in this article exhibits some notable advantages such as short reaction times, operational simplicity, green reaction conditions, high yields and easy work-up and purification steps. In addition, the novel magnetic nano-composite could be easily recovered by an external magnetic field and reused for six-reaction cycles without significant loss of its catalytic
Synthesis and characterization of sodium polyaspartate‐functionalized silica‐coated magnetite nanoparticles: A heterogeneous, reusable and magnetically separable catalyst for the solvent‐free synthesis of 2‐amino‐4
<i>H</i>
‐chromene derivatives
2‐amino‐4H‐chromene derivatives via one‐pot three‐component reactions. This novel material showed great catalytic performance and the reactions which were carried out by this catalyst showed good to excellent yields. Besides, the catalyst could easily be separated from the reaction mixture by using an external magnetic field and it was stable enough to reuse several times without any significant reduction
Studies on the Synthesis of Substituted 2-amino-4<i>H</i>-benzo[<i>h</i>]chromene and 3-amino-1<i>H</i>-benzo[<i>f</i>]chromene Derivatives Using Base Supported Ionic Liquid Like-phase (SILLP) as an Efficient Green Catalyst
The synthesis of several substituted 2-amino-4H-benzo[h]chromene and 3-amino-1H-benzo[f]chromenederivatives was carried out using a one-pot three-component reaction of an arylaldehyde, malononitrile and a naphthol in H2O and in the presence of recyclable base supported ionicliquid like-phase as an efficient green catalyst.