scholarly journals A new one-pot three-component synthesis of 4-aryl-6-cycloamino-1,3,5-triazin-2-amines under microwave irradiation

Synthesis ◽  
2021 ◽  
Author(s):  
Muhammad Syafiq Bin Shahari ◽  
Ahmad Junaid ◽  
Edward R. T. Tiekink ◽  
Anton V. Dolzhenko
Keyword(s):  
Microwave Irradiation ◽  
Aromatic Aldehydes ◽  
Antileukemic Activity ◽  
One Pot ◽  
Biological Screening ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cyclic Amines ◽  
Three Component Reaction ◽  
Fast Synthesis

A new method for the fast synthesis of diverse 4-aryl-6-cycloamino-1,3,5-triazin-2-amines was developed. The synthesis is performed under microwave irradiation in a one-pot manner from cyanoguanidine, aromatic aldehydes, and cyclic amines. Their three-component reaction in the presence of hydrochloric acid produced dihydrotriazines, which were then converted (without isolation) to the targeted compounds via aromatic dehydrogenation in the presence of alkali. The reaction tolerated various aromatic aldehydes (including heterocyclic) and cyclic amines. Crystal structures of two representative 4-aryl-6-morpholino-1,3,5-triazin-2-amines were established by X-ray crystallography. The results of preliminary biological screening identified potent antileukemic activity for 6-(3,4-dihydroisoquinolin-2(1<i>H</i>)-yl)-4-phenyl-1,3,5-triazin-2-amine.

scholarly journals Ferrocene-Containing Ionic Liquid Supported on Silica Nanospheres (SiO2@Imid-Cl@Fc) as a Mild and Efficient Heterogeneous Catalyst for the Synthesis of Pyrano[3,2-b]Pyran Derivatives Under Ultrasound Irradiation

2018 ◽  
Vol 42 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Reza Teimuri-Mofrad ◽  
Somayeh Esmati ◽  
Masoumeh Rabiei ◽  
Mahdi Gholamhosseini-Nazari
Keyword(s):  
Ionic Liquid ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Ultrasound Irradiation ◽  
Xrd Analysis ◽  
Catalytic Performance ◽  
Significant Loss ◽  
One Pot ◽  
X Ray ◽  
Three Component Reaction

A novel heterogeneous silica nanosphere-supported ferrocene-containing ionic liquid catalyst (SiO2@Imid-Cl@Fc) was designed and synthesised and was systematically characterised by Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) analysis. The catalytic activity of the SiO2@Imid-Cl@Fc catalyst was tested in a one-pot, three-component reaction of malononitrile and kojic acid with 15 aromatic aldehydes at room temperature under ultrasound irradiation. The products were pyrano[3,2-b]pyran derivatives, four of which are new. The catalyst exhibited good catalytic performance over short reaction times (15–20 min) and could be recycled at least five times without significant loss of activity.

scholarly journals Synthesis, X-ray crystal structure, Hirshfeld surface analysis, and molecular docking studies of DMSO/H2O solvate of 5-chlorospiro[indoline-3,7'-pyrano[3,2-c:5,6-c']dichromene]-2,6',8'-trione

2021 ◽  
Vol 12 (4) ◽  
pp. 382-388
Author(s):  
Varun Sharma ◽  
Bubun Banerjee ◽  
Aditi Sharma ◽  
Vivek Kumar Gupta
Keyword(s):  
Crystal Structure ◽  
Molecular Docking ◽  
Direct Method ◽  
Docking Studies ◽  
One Pot ◽  
X Ray ◽  
Molecular Docking Studies ◽  
X Ray Crystallography ◽  
Three Component Reaction ◽  
Inhibition Property

The title compound, 5-chlorospiro[indoline-3,7'-pyrano[3,2-c:5,6-c']dichromene]-2,6',8'-trione was synthesized via one-pot pseudo three-component reaction between one equivalent of 5-chloroisatin and two equivalents of 4-hydroxycoumarin using mandelic acid as catalyst in aqueous ethanol at 110 °C. The synthesized compound was characterized by FT-IR, 1H NMR, and HRMS techniques. Single crystals were grown for crystal structure determination by using single X-ray crystallography technique. It was found that the crystals are triclinic with space group P-1 and Z = 1. The crystal structure was solved by direct method and refined by full-matrix least-squares procedures to a final R-value of 0.0688 for 6738 observed reflections. The crystal structure was stabilized by elaborate system of O-H···O, N-H···O, and C-H···O interactions with the formation of supramolecular structures. 3D Hirshfeld surfaces and allied 2D fingerprint plots were analyzed for molecular interactions. Molecular docking studies have been performed to get insights into the inhibition property of this molecule for Human topoisomerase IIα.

scholarly journals Microwave-assisted efficient one-pot synthesis of N 2-(tetrazol-5-yl)-6-aryl/heteroaryl-5,6-dihydro-1,3,5-triazine-2,4-diamines

2020 ◽  
Vol 16 ◽  
pp. 1706-1712
Author(s):  
Moustafa Sherief Moustafa ◽  
Ramadan Ahmed Mekheimer ◽  
Saleh Mohammed Al-Mousawi ◽  
Mohamed Abd-Elmonem ◽  
Hesham El-Zorba ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Aromatic Aldehydes ◽  
One Pot ◽  
X Ray ◽  
X Ray Crystallography ◽  
Microwave Assisted ◽  
One Pot Synthesis ◽  
High Yields

An efficient one-pot synthesis of N 2-(tetrazol-5-yl)-6-aryl/heteroaryl-1,3,5-triazine-2,4-diamine derivatives was developed by reacting 5-amino-1,2,3,4-tetrazole with aromatic aldehydes and cyanamide in pyridine under controlled microwave heating with high yields. X-ray crystallography confirmed the structure of the obtained products.

scholarly journals X-ray crystal structure analysis of 5-bromospiro[indoline-3,7'-pyrano[3,2-C:5,6-C']dichromene]-2,6',8'-trione

2021 ◽  
Vol 12 (2) ◽  
pp. 187-191
Author(s):  
Varun Sharma ◽  
Bubun Banerjee ◽  
Gurpreet Kaur ◽  
Vivek Kumar Gupta
Keyword(s):  
Crystal Structure ◽  
Direct Methods ◽  
Crystal Structure Analysis ◽  
One Pot ◽  
X Ray ◽  
X Ray Crystallography ◽  
Naturally Occurring ◽  
Three Component Reaction ◽  
Ft Ir ◽  
Solvent Molecules

An analog of spirooxindole[pyrano-bis-2H-l-benzopyran] derivatives namely 5-bromospiro [indoline-3,7'-pyrano[3,2-c:5,6-c']dichromene]-2,6',8'-trione was synthesized via one-pot pseudo three-component reaction of one equivalent of 5-bromoisatin and two equivalents of 4-hydroxycoumarin using mandelic acid as a naturally occurring organo catalyst in aqueous ethanol under reflux conditions. The synthesized compound was characterized by FT-IR, 1H NMR, 13C NMR, and HRMS data. Crystal structure was determined by using single X-ray crystallography technique. It was found that the crystals are triclinic with space group P-1, C108H60Br4N4O29S2: a = 11.8333(6) Å, b = 12.8151(6) Å, c = 17.1798(8) Å, α = 77.317(4)°, β = 74.147(4)°, γ = 66.493(5)°, V = 2280.0(2) Å3, Z = 1, T = 149.99(10) K, μ(MoKα) = 1.902 mm-1, Dcalc = 1.647 g/cm3, 11545 reflections measured (3.836° ≤ 2Θ ≤ 50.998°), 8310 unique (Rint = 0.0488, Rsigma = 0.0875) which were used in all calculations. The final R1 was 0.0622 (I > 2σ(I)) and wR2 was 0.1994 (all data). The crystal structure was solved by direct methods and refined by full-matrix least-squares procedure to a final R-value of 0.0622 for 6264 observed reflections. The crystal structure was stabilized by an elaborate system of N-H···O, O-H···O, C-H···π, and π···π interactions involving solvent molecules to form supramolecular structure.

scholarly journals A facile and one-pot synthesis of new tetrahydrobenzo[b]pyrans in water under microwave irradiation

BMC Chemistry ◽  
2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Mandlenkosi Robert Khumalo ◽  
Surya Narayana Maddila ◽  
Suresh Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Microwave Irradiation ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
One Pot ◽  
Spectral Techniques ◽  
H Nmr ◽  
Water As Solvent ◽  
Aqueous Solvent ◽  
Three Component Reaction ◽  
C Nmr

AbstractEleven new tetrahydrobenzo[b]pyran derivatives were synthesized via a three component reaction of different aromatic aldehydes, methyl cyanoacetate and 1,3-cyclohexadione, with water as solvent under catalyst-free microwave irradiation. The structures of all the new molecules were well analysed and their structures established by using various spectral techniques (1H NMR, 13C NMR, 15N NMR and HRMS). Various advantages of reported protocol are the ease of preparation, short reaction times (10 min), aqueous solvent and excellent yields (89–98%). Additionally, this method provides a clean access to the desired products by simple workup.

scholarly journals Microwave-assisted efficient one-pot synthesis of N 2-(tetrazol-5-yl)-6-aryl/heteroaryl-2,3-dihydro-1,3,5-triazine-2,4-diamines

2020 ◽  
Author(s):  
Moustafa Moustafa ◽  
Ramadan Mekheimer ◽  
Saleh Al-Mousawi ◽  
Mohamed Abd-Elmonem ◽  
Hesham El-Zorba ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Aromatic Aldehydes ◽  
One Pot ◽  
X Ray ◽  
X Ray Crystallography ◽  
Microwave Assisted ◽  
One Pot Synthesis ◽  
High Yields

An efficient one-pot synthesis of N 2-(tetrazol-5-yl)-6-aryl/heteroaryl-1,3,5-triazine-2,4-diamine derivatives was developed by reacting 5-amino-1,2,3,4-tetrazole with aromatic aldehydes and cyanamide in pyridine under controlled microwave heating with high yields. X-ray crystallography confirmed the structure of obtained products.  

Zirconium complexes of a cyclopentadienyl-amido ligand with a pendant amine donor via amine and alkane elimination

1996 ◽  
Vol 74 (9) ◽  
pp. 1696-1703 ◽  
Author(s):  
Ying Mu ◽  
Warren E. Piers ◽  
Donald C. MacQuarrie ◽  
Michael J. Zaworotko
Keyword(s):  
Lewis Acids ◽  
Methyl Chloride ◽  
Monoclinic Space Group ◽  
One Pot ◽  
Amido Complexes ◽  
X Ray ◽  
X Ray Crystallography ◽  
Zirconium Complexes ◽  
Alkane Elimination

Zirconium complexes of the multidentate ligand CpHNMeSiN(H)R (SiNR = -SiMe2N-t-butyl; NMe = -CH2CH2NMe2, 1) were prepared and characterized via amine and alkane elimination procedures. Reaction of 1 with Zr(NMe2)4 gave a mixture of bis-amido complexes 2 in which the ligand was 1,2 and 1,3 substituted. This mixture was converted to the analogous dichlorides 3 using Me2NH•HCl and 1,3-3 was purified at this stage; alternatively, 1,3-3 was obtained in one pot from 1 and Zr(NMe2)4 in ≈70% yield. Conversion of 1,3-3 to dimethyl compound (CpNMeSiNR)Zr(CH3)2, 1,3-4, was accomplished via reaction of the dichloride with methyllithium; methide abstraction with the Lewis acids B(C6F5)3 and [Ph3C]+[B(C6F5)4]− generated the cationic alkyls [(CpNMeSiNR)Zr(CH3)]+[R′B(C6F5)3]− (R′ = CH3, 6a; C6F6, 6b), which were characterized by NMR spectroscopy. Zirconium complexes containing 1 ligated as its 1,2 isomer were obtained from alkane elimination reactions between 1 and in situ prepared RnZrCl4−n (R = CH3, n = 3; R = CH2SiMe3, n = 2). 1,2-3 and the methyl chloride complex 1,2-(CpNMeSiNR)Zr(CH3)Cl, 5, were obtained in 18 and 30% yield, respectively. Complex 5 was characterized by X-ray crystallography (monoclinic, space group P21/a, a = 9.6951(10) Å, b = 14.3794(16) Å, c = 14.364(3) Å, V = 1990.3(5) Å3, Z = 4, R = 0.046, Rw = 0.041.) Key words: amine elimination, Cp-amido, zirconium complexes.

Reactions of Methyl Ketones and (Hetero)arylcarboxamides with N,N-Dimethylacetamide Dimethyl Acetal. A Simple Metal-Free Synthesis of 2,4,6-Trisubstituted Pyridines

2015 ◽  
Vol 68 (2) ◽  
pp. 184 ◽  
Author(s):  
Benjamin Prek ◽  
Uroš Grošelj ◽  
Marta Kasunič ◽  
Silvo Zupančič ◽  
Jurij Svete ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Single Crystal ◽  
Ammonium Acetate ◽  
Dimethyl Acetal ◽  
Methyl Ketones ◽  
Closed Vessel ◽  
Simple Metal ◽  
One Pot ◽  
X Ray ◽  
Metal Free

Two metal-free syntheses of 2,4,6-trisubstituted pyridines 10a–m and 16a–j are described. N,N,6-Trimethyl-4-(substituted)pyridin-2-amines 10 were prepared from aryl or heteroaryl methyl ketones which were transformed with N,N-dimethylacetamide dimethyl acetal (DMADMA) into enaminones 4a–m, followed by treatment with ammonium acetate to give (Z)-3-amino-1-(substituted)but-2-en-1-ones 5a–m. These were treated with DMADMA under microwave irradiation in a closed vessel at 130°C, to give via intermediates 7–9 the final products 10a–m. N2,N2,N4,N4-Tetramethyl-6-(substituted) pyridine-2,4-diamines 16a–j were prepared in a one-pot synthesis from the corresponding carboxamides 11a–j by treatment with an excess of DMADMA in a closed vessel under microwave irradiation to give via intermediates 12a–j to 15a–j the final products 16a–j. X-Ray single crystal diffractometry studies of the enaminones 5c, 5g, 5i, 5j, and 5m and 2,4,6-trisubstituted pyridines 16a, 16b, 16g, 16i, and 16j were consistent with the expected structures.

Silane catecholates: versatile tools for self-assembled dynamic covalent bond chemistry

2019 ◽  
Vol 55 (43) ◽  
pp. 6066-6069 ◽  
Author(s):  
Yoshiteru Kawakami ◽  
Tsuyoshi Ogishima ◽  
Tomoki Kawara ◽  
Shota Yamauchi ◽  
Kazuhiko Okamoto ◽  
...  
Keyword(s):  
Covalent Bond ◽  
One Pot ◽  
X Ray ◽  
X Ray Crystallography ◽  
Self Assembled

Shape-persistent macrocycles and 3D nanocages have been prepared in one-pot under MeCN-promoted dynamic covalent bond conditions starting from silane catecholates, whose structures were confirmed by X-ray crystallography.

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