描述了一种在无溶剂介质中制备4 H-嘧啶并[2,1- b ]苯并噻唑衍生物的新型氟化铁辅助方便高效策略。该反应可以在低催化剂负载下以优异的官能团耐受性进行。催化剂可以容易地回收并再用于至少三轮反应的下一步反应,而对产物的收率没有任何明显的影响。易于回收的催化剂和高收率的产品使该方案具有吸引力,可持续性和经济性。
Iron fluoride: the most efficient catalyst for one-pot synthesis of 4H-pyrimido[2,1-b]benzothiazoles under solvent-free conditions
作者:Amol B. Atar、Yong Seok Jeong、Yeon Tae Jeong
DOI:10.1016/j.tet.2014.05.094
日期:2014.8
A new iron fluoride assisted convenient and efficient strategy for the preparation of 4H-pyrimido[2,1-b]benzothiazolesderivatives in solvent-free media is described. The reactions can be performed at low-catalyst loadings with excellent functional group tolerance. The catalyst can be readily recovered and reused for next reaction for at least three runs without any significant impact on the yields
描述了一种在无溶剂介质中制备4 H-嘧啶并[2,1- b ]苯并噻唑衍生物的新型氟化铁辅助方便高效策略。该反应可以在低催化剂负载下以优异的官能团耐受性进行。催化剂可以容易地回收并再用于至少三轮反应的下一步反应,而对产物的收率没有任何明显的影响。易于回收的催化剂和高收率的产品使该方案具有吸引力,可持续性和经济性。
Green and highly efficient MCR strategy for the synthesis of pyrimidine analogs in water via C–C and C–N bond formation and docking studies
protocol has many fascinating features, viz. high product yields, eco-friendly, milder reaction conditions, avoiding the use of hazardous solvent, and easily recoverable and reusable catalyst. The good functional group tolerance with a series of derivatives has been demonstrated. Molecular docking studies were performed on the synthesized compounds using Staphylococcus aureus dihydropteroate synthase (saDHPS)
Synthesis, characterization and catalytic application of tributyl(carboxymethyl)phosphonium bromotrichloroferrate as a new magnetic ionic liquid for the preparation of 2,3-dihydroquinazolin-4(1H)-ones and 4H-pyrimidobenzothiazoles
作者:Mohammad Reza Anizadeh、Mohammad Ali Zolfigol、Meysam Yarie、Morteza Torabi、Saeid Azizian
DOI:10.1007/s11164-020-04183-y
日期:2020.8
magnetic ionicliquid bearing acetic acid tags was synthesized and characterized by several methods including Fourier transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), vibrating sample magnetometer (VSM), thermogravimetric analysis (TGA) and derivative thermogravimetry analysis (DTG). The prepared magnetic ionicliquid was applied as catalyst for synthesis of 2,3-
Preparation and characterization of Lewis acid grafted sulfonated carbon@titania composites for the multicomponent synthesis of 4H-pyrimido[2,1-b]benzothiazoles and benzoxanthenones under solvent-free conditions
作者:Manmeet Kour、Satya Paul、James H. Clark、Vivek K. Gupta、Rajni Kant
DOI:10.1016/j.molcata.2015.11.001
日期:2016.1
A series of novel and highly efficient Lewis acids covalently grafted over sulfonic acid functionalized carbon@titania composites were successfully synthesized via sulfonation of carbon@titania composites followed by treatment with different Lewis acids like AlCl3, FeCl3, SbCl3, SnCl2, Cu(OAc)(2) and Bi(NO3)(3), The utility of the developed catalysts was explored for the synthesis of a diverse range of 4H-pyrimido[2,1-b]benzothiazoles and benzoxanthenones, and among various catalysts, C/TiO2-SO3-SbCl2 was found to be the most active. We report here the synthesis of five novel compounds and the structure of one of the compounds has also been confirmed by single-crystal X-ray diffraction. All the five prepared composites were characterized by FTIR and ICP-AES analysis, whereas the most active one, C/TiO2-SO3-SbCl2 was further characterized by XRD, EDX, CHNS, SEM, TEM, HRTEM and TGA. The catalyst can be recovered and reused for atleast five runs without any significant impact on catalytic activity and selectivity. The high catalytic activity, thermal stability, simple recovery and reusability, and eco-friendly nature of the catalyst makes the present method to be particularly attractive from the view point of green chemistry. (C) 2015 Elsevier B.V. All rights reserved.
Highly efficient and diversity-oriented solvent-free synthesis of biologically active fused heterocycles using glycerol-based sulfonic acid
A series of fused derivatives confirmed the high functional group tolerance of the present protocol. The fabricated pathway has numerous advantages like high yields of desired products, green, solvent-free, and use of easily recoverable and reusable heterogeneous catalyst. Further, the anti-microbial results confirmed that among the synthesized compounds, compounds 4c and 6a were found more active
本文涉及在催化量的甘油基磺酸中使用芳香醛、1,3-环二酮(二甲酮/环己二酮)和脲/2-氨基苯并噻唑制备一些新型稠合喹唑啉类似物。通过使用甘油基磺酸作为催化剂,金属污染的威胁已被根除。这种 MCR 策略的假定机制类似于 Biginelli 反应,包括 Knoevenagel 缩合和 Michael 加成。一系列融合衍生物证实了本协议的高官能团耐受性。制备的途径具有许多优点,如所需产物的高收率、绿色、无溶剂以及使用易于回收和可重复使用的多相催化剂。更远,发现与环丙沙星相比,4c和6a对测试的细菌菌株更有活性。与氟康唑相比,发现化合物4g和6a对测试的真菌菌株更有活性。 图形概要