CAL-B accelerated novel synthetic protocols for 3,3’-arylidenebis-4-hydroxycoumarins and dimethyl ((substituted phenyl) (phenylamino)methyl) phosphonates
作者:Anusaya S. Chavan、Arun S. Kharat、Manisha R. Bhosle、Sambhaji T. Dhumal、Ramrao A. Mane
DOI:10.1007/s11164-021-04535-2
日期:2021.11
Green protocols for the syntheses of 3,3′-arylidenebis-4-hydroxycoumarins and dimethyl ((substituted phenyl) (phenylamino)methyl) phosphonates have been first time developed using biocatalyst, CAL-B (lipase). These are carried at room temperature under stirring and are convenient and cost effective. The developed protocols are environmentally acceptable and are giving better to excellent yields of
Ionic liquid [Dabco-H][AcO] as a highly efficient and recyclable catalyst for the synthesis of various bisenol derivatives via domino Knoevenagel–Michael reaction in aqueous media
作者:Cheng Yang、Wan-Qi Su、Da-Zhen Xu
DOI:10.1039/c6ra23018k
日期:——
A simple and highly efficient domino Knoevenagel–Michael reaction procedure for the synthesis of a series of bisenols has been successfully developed. In the presence of 1,4-diazabicyclo[2.2.2]octane (Dabco)-based ionicliquid catalysts, which are environmental friendly, inexpensive, and recyclable, the reaction afforded the corresponding bisenols compounds in excellent yields within short times in
make this reaction simple and green, herein, we used Fe3O4@SiO2@KIT-6 to synthesis of bis coumarinylmethanes by the one-pot reaction of 4-hydroxycoumarin and various benzaldehydes at room temperature. Conclusion: In conclusion, we have investigated the Fe3O4@SiO2@KIT-6 as a mild and efficient catalyst for the synthesis of substituted bis coumarin compounds. The remarkable advantages offered by this method
香豆素构成天然化合物的主要类别之一。在著名的香豆素衍生物家族中,二聚香豆素(也称为双香豆素)占据着有趣的位置。尽管这些化合物的某些类型可以从植物中分离出来,并且由于其作为生物活性剂的用途而对其化学感兴趣。它也代表了几个具有药物重要性的分子的核心结构。据报道,香豆素可以用作抗癌,抗微生物,抗炎,抗凝剂。香豆素的这些药理特性引起了我们对合成某些香豆素衍生物的兴趣。 方法:在室温下搅拌醛,4-羟基香豆素,H 2 O和Fe 3 O 4 @SiO 2 @ KIT-6。反应完成后,我们用CHCl 3 / H 2 O萃取产物。反应完成后,Fe 3 O 4 @SiO 2 @ KIT-6磁性纳米粒子很容易通过磁体(1.4 T ),并将反应混合物滤出。然后,将5mL蒸馏水加入到烧杯中,并将得到的沉淀物滤出。最后,将粗产物用乙醇重结晶,得到纯产物。产品的身份和纯度通过IR进行了确认,1 H NMR,13 C NMR和元素分析。
Biscoumarin: new class of urease inhibitors; economical synthesis and activity
作者:Khalid Mohammed Khan、Sajid Iqbal、Muhammad Arif Lodhi、Ghulam Murtaza Maharvi、Zia- Ullah、Muhammad Iqbal Choudhary、Atta-ur- Rahman、Shahnaz Perveen
DOI:10.1016/j.bmc.2004.01.010
日期:2004.4
A variety of biscoumarins (1-21) with variable substituents at C-11 were synthesized with an improved method and evaluated as urease inhibitors. The synthesized compounds showed varying degree of urease inhibitory activity ranging from 15.06-91.35 muM. The size and electron donating or withdrawing effects of substituents influenced the activity, which lead to the urease inhibitors. (C) 2004 Elsevier Ltd. All rights reserved.
Facile and Straightforward Synthesis of Racemic Version of Substituted 3-[3-(2-Hydroxyphenyl)-3-oxo-1-arylpropyl]-4-hydroxycoumarins: Easy Access to a Series of Biorelevant Warfarin Analogues
The present communication deals with a straightforward, efficient, and green synthesis of a series of racemic version of 3-[3-(2-hydroxyphenyl)-3-oxo-1-arylpropyl]-4-hydroxycoumarins as biologically interesting warfarin analogues upon decarboxylative hydrolysis of bis-coumarin derivatives in aqueous potassium hydroxide solution. The salient features of this practical method are operational simplicity