A catalytic route to carbamothioate derivatives through a reaction involving isocyanides, elemental sulfur, and aryl iodides has been developed. The reaction scope has been examined using a range of ...isocyanides and aryl iodides. The reactions involve two consecutive C–S bond formations. Control experiment revealed that the reaction proceeds through an iminium species.
Graphic abstract
MgO-MgAl2O4 nanocomposite was prepared from the co-precipitation of Mg(NO3)2 and Al(NO3)3 salts, characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive ...X-ray spectroscopy (EDS) and fourier transform infrared spectroscopy (FTIR) techniques and evaluated in the synthesis of thirty five derivatives of benzo4,5thiazolo3,2-achromeno4,3-dpyrimidin-6-ones (d1-d34) via the multi-component reaction of 4-hydroxycoumarins, aldehydes, and 2-aminobenzothiazole derivatives under solvent free condition. The catalytic activity of MgO-MgAl2O4 nanocomposite and the synthesis of the above mentioned compounds were investigated under thermal solvent free (times: 1.4–3 h; yields: 75–95%), ultrasonic irradiation (US) conditions (times: 1–2.5 h; yields: 69–97%) and using high-speed ball milling (HSBM) technique (times: 0.7–2.5 h; yields: 67–97%). In all cases, the products were obtained in excellent yields. Nuclear Magnetic Resonance (NMR) and MASS spectroscopy were used to characterize the structure of the desired product. The mechanism for the preparation of compounds d1-d34 was proposed and confirmed by 1H NMR investigations.
In this report, in situ generated sulfide has been reacted with sulfonylketimine derived from the reaction of alkynes and sulfonyl azides by the action of copper salts to form a wide range of ...thioamide derivatives. Various terminal alkynes including aromatic, heteroaromatic, and aliphatic alkynes have been well tolerated and the reaction also shows good generality along with azides.
Graphic abstract
Abstract
In this, a three-component reaction for the preparation of novel tetrazolo1,5-apyrimidine-6-carboxamide derivatives from
N,N′
-(sulfonylbis(1,4-phenylene))bis(3-oxobutanamide), aldehydes and ...1
H
-tetrazol-5-amine is reported. The application of Fe
3
O
4
@SiO
2
-(PP)(HSO
4
)
2
(A) as a catalyst afforded the desired products
(a
1
–a
18
)
in high yields in DMF as solvent as well as under solvent-free conditions.
Polyethyleneimine (PEI) has been reported to have good potential for the adsorption of metal ions. In this work, PEI was covalently bound to NiFe2O4@SiO2 nanoparticles to form the new adsorbent ...NiFe2O4@SiO2–PEI. The material allowed for magnetic separation and was characterized via powder X-ray diffraction (PXRD), showing the pattern of the NiFe2O4 core and an amorphous shell. Field emission scanning electron microscopy (FE-SEM) showed irregular shaped particles with sizes ranging from 50 to 100 nm, and energy-dispersive X-ray spectroscopy (EDX) showed high C and N contents of 36 and 39%, respectively. This large amount of PEI in the materials was confirmed by thermogravimetry–differential thermal analysis (TGA-DTA), showing a mass loss of about 80%. Fourier-transform IR spectroscopy (FT-IR) showed characteristic resonances of PEI dominating the spectrum. The adsorption of CrO42−, Ni2+, and Pb2+ ions from aqueous solutions was studied at different pH, temperatures, metal ion concentrations, and adsorbent dosages. The maximum adsorption capacities of 149.3, 156.7, and 161.3 mg/g were obtained for CrO42−, Ni2+, and Pb2+, respectively, under optimum conditions using 0.075 g of the adsorbent material at a 250 mg/L ion concentration, pH = 6.5, and room temperature.
In this paper, calcium iodate nanoparticles were first synthesized by the modified reaction of Ca(NO
3
)
2
and KIO
3
in an aqueous medium under ultrasonic irradiation. The structure of nanocatalyst ...was then characterized by FT-IR, FESEM, EDX, XRD, and BET techniques. Afterward, the fabricated Ca(IO
3
)
2
was applied as a nanocatalyst in the facile synthesis of heterocycles including quinoxalines, 5,6-dicyano pyrazines, and pyrido2,3-bpyrazines. For this purpose, the feasibility of the reaction in the presence of different catalyst amounts, solvents, and temperatures was first investigated. Next, the target compounds were obtained by the condensation reaction of aryl-1,2-diamines or 2,3-diaminomaleonitrile with 1,2-diketones in the presence of a catalytic amount of Ca(IO
3
)
2
in ethanol or acetic acid solvents at ambient temperature in good to excellent yields. One of the salient advantages of this work is the synthesis of calcium iodate nanoparticles by chemical precipitation method and its application as a heterogeneous nanocatalyst for the first time in the synthesis of organic compounds. The other important benefits of this process are the use of an inexpensive, safe, stable and recyclable catalyst, high product yields, short reaction times, and easy isolation of the product in pure form.
Two novel coordination polymers, Hg(bib
Me
)Cl
2
n
(1), Hg
3
(bib)
2
(NCS)
6
n
(2), were prepared at room temperature by the reaction of appropriate salts of mercury(II) with ...1,4-bis(2-methylimidazolyl)butane (
bib
Me
) and 1,4-bis(imidazolyl) butane (
bib
) flexible linker ligands. The compounds were characterized by elemental analysis, IR spectroscopy, and single crystal X-ray diffraction. The mercury(II) ions adopt distorted tetrahedral geometry (HgNCl
3
) in 1, while trigonal bipyramidal coordination environment (HgN
2
S
3
) and octahedral arrangement (HgN
4
S
2
) in 2. In 1, one bib
Me
ligand is coordinated to one central Hg(II) to form a 3D framework with point symbol: 6
5
.8. However, in 2, one or two bib ligands are coordinated to Hg(II) centers to form an open 3D framework with point symbol: 4
4
.6
10
.8.
Two previously described Brønsted acidic ionic liquids, 3,3'-(1,6-hexanediyl)bis(1-methyl)-1
-imidazolium hydrogen sulfate (
) and 1,1'-(1,6-hexanediyl)bis(pyridinium) hydrogen sulfate (
), were used ...as catalysts for the preparation of spirofuran-2,3'-indoline-3-carboxylate derivatives via a three-component reaction of anilines, isatins (
-alkyl-indoline-2,3-diones), and diethyl acetylenedicarboxylate, in high yields. The use of ultrasonic (US) irradiation led to the targeted products (
-
) in high yields ranging from 80% to 98%. Under the same conditions, the use of sulfuric acid and acetic acid as a Brønstedt catalyst did not yield the desired benchmark product
.
In this work, a method has been developed for the formal, multi-component reaction of cyclopropyl dicarboxylates, aldehydes, and amines under ultrasonic irradiation. The symmetrical dibromide salt ...(A) was prepared from the reaction of 1,2-bis(2-bromoethoxy)ethane with 2,3,4,6,7,8-hexahydropyrrolo1,2-apyrimidine in toluene under reflux condition. CeCl3 and compound (A) were used as catalyst and promoter and showed a good potential for application in the synthesis of a range of structurally diverse pyrrolidine rings in short reaction times (3–5 h) and excellent yields (89–97 %).
A green and facile precipitation method was developed for the preparation of Zn
2
SnO
4
nano-particles in an orange peel (from north Iran) waste extract medium. The as-prepared and calcined samples ...were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), and UV-vis, photoluminescence (PL) and diffuse reflectance spectroscopy (DRS). The catalytic potential of the fresh sample of Zn
2
SnO
4
nano-particles was examined on the four-component reaction of 2-hydroxynaphthalene-1,4-dione, 2-aminoaniline, 2-aminopyridine/pyrazin-2-amine, and N-methyl-4-piperidone/aromatic aldehydes under ultrasonic irradiation (US) condition leads to the preparation of some phenazine derivatives.
![Preparation of benzo[4,5]th...](http://api.summon.serialssolutions.com/2.0.0/image/issn/XR4PS5YY4K/1878-5352_1878-5379/small "Preparation of benzo[4,5]thiazolo[3,2-a]chromeno[4,3-d]pyrimidin-6-one derivatives using MgO-MgAl2O4 composite nano-powder")
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