One-pot three-component synthesis, structure and redox properties of ferrocenyl isoxazoles

A consecutive coupling-cycloaddition sequence of acid chlorides, terminal alkynes, and in situ generated nitrile oxides furnishes ferrocenyl substituted redox active isoxazoles in moderate to good yields. The structure was unambiguously assigned by X-ray structure analyses and the electronic structure was elucidated by computational methods. Redox potentials of all representatives are strongly effected by the electronic nature of the bridging isoxazoloyl moiety.     

One-pot synthesis of Schiff-base-containing Ni8 clusters: solvothermal synthesis, structure, and magnetic properties

Solvothermal in situ generation of a Schiff-base ligand (L) in the presence NiCl(2) and trimesic acid (H(3)BTC) in ethanol resulted in clusters, Ni(8)(L)(4)Cl(8).(H(2)O)(0.5), consisting of three different coordination geometries, four paramagnetic and four diamagnetic Ni(II), exhibiting both ferromagnetic and antiferromagnetic exchange interactions.     

[2+2]型苯并咪唑环番的一锅法合成

超分子化学是当今化学中发展迅速、极具前景的研究领域.分子识别是形成超分子化合物的基础.环番由于兼备冠醚、环糊精和多齿配体的一些特性,在分子识别、离子识别、超分子催化、模拟酶、分子自组装、材料科学等方面得到了广泛关注.     

One-pot synthesis of 2-substituted quinoxalines using K10-montmorillonite as heterogeneous catalyst

An efficient one-pot synthesis of 2-substituted quinoxalines from 1,2-diamines and phenacyl bromides is developed using K10-montmorillonite (K10 clay) as a catalyst at 50 °C in acetonitrile medium. This method offers an easy route for the synthesis of substituted quinoxalines in high yields. A plausible mechanism is proposed in which quinoxalines are formed via dehydration–dehydrohalogenation–cyclization sequence. Further, the K10 clay catalyst is recovered by simple filtration and reused six times without any loss in its catalytic activity.     

One-pot synthesis of polysubstituted pyrimidines

A series of polysubstituted pyrimidines were synthesized from in situ generated α,β-unsaturated imines and the corresponding amidine or guanidine derivatives in a convenient one-pot procedure.     

螺羟吲哚类杂环衍生物的一锅法合成

在室温和水作溶剂条件下,阴离子交换树脂IRA-900有效催化含不同取代基的靛红、丙二腈和1,3-环己二酮,一锅法合成了12个相应的螺羟吲哚类杂环衍生物,其产率高达92%~99%.同时讨论了催化剂的种类、溶剂用量和催化剂的重复使用次数对反应的影响,并对IRA-900催化剂的反应机理进行了初步探讨.该方法具有条件温和,实验操作简单,以及催化剂能重复使用等优点,为螺羟吲哚类杂环衍生物提供了一条绿色合成方法.     

One-pot synthesis of 2-trifluoromethylchromones

We report a simple and suitable method for the preparation of useful 2-trifluoromethylchromones in one step, in high yields and avoiding the use of solvents. We were able to detect the intermediate of this reaction. Furthermore a mechanism for the formation of the 7-methoxy-3-trifluoroacetyl-2-trifluoromethylchromone through the unexpected double trifluoroacetylation of 4-methoxy-2-hydroxyacetophenone followed by dehydration is also proposed. All compounds are fully identified and characterized by spectroscopic techniques.     

One-pot synthesis of dendritic polyamide

Dendritic polyamides with polydispersity of 1.1–1.4 have been successfully prepared from trimesic acid, 5-aminoisophthalic acid, and 4-aminophenylpropionic acid as a core molecule, a dendron, and a spacer unit, respectively, with a one-pot procedure. This procedure involves successive activation of end carboxyl groups with the condensing agent diphenyl (2,3-dihydro-2-thioxo-3-benzoxazolyl)phosphonate (DBOP), followed by condensation of active amide with 5-aminoisopthalic acid or 4-aminophenylpropionic acid and, finally, capping of the end carboxyl groups with p-anisidine. The structure of dendritic polyamides was investigated by ¹H-NMR spectroscopy, and it was found that the polymers obtained contained approximately 10% defects. Furthermore, the model reaction was studied to demonstrate the feasibility of dendritic polyamides. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3638–3645, 1999     

One-pot synthesis of triazole-linked glycoconjugates

Highly efficient one-pot synthesis of 1,2,3-triazole-linked glycoconjugates was presented involving a Cu(I) catalyzed 1,3-dipolar cycloaddition as the key step. It offers a convenient route to prepare neoglycoconjugates derived from unprotected saccharides or peracetylated saccharides.     

One-pot synthesis of multifunctionalized cyclopropanes

A facile one-step synthetic protocol toward multifunctionalized cyclopropanes 4 is developed from substituted chalcones 1 and sulfones 2 in good yields via a [2C+1C] annulation.     

One-pot synthesis and crystal structure of diaquabis(hydrazoneglyoxylato)cadmium(II)

The mononuclear complex [Cd(H₂NNCHCOO)₂(H₂O)₂] has been prepared from an aqueous solutions of reactants by one-pot synthesis and is characterized by IR, TG-DTA and single-crystal X-ray diffraction studies. The cadmium ion has distorted octahedral coordination (C ₂ symmetry) with two trans water molecules and oxygen and nitrogen donors forming two five-membered chelate rings. On heating, the anhydrous complex decomposes in two steps yielding CdO.     

One-pot synthesis of cage alcohols

An efficient one-pot procedure has been developed for the synthesis of cage alcohols with hydroxy groups in the bridgehead positions. The procedure includes initial nitroxylation with nitric acid or a mixture of nitric acid with acetic acid and subsequent hydrolysis in the presence of urea.     

One-pot synthesis of two dioxoheterocycles

Russian Journal of Organic Chemistry -     

One-pot general synthesis of metalloporphyrins

A new general one-pot method for the synthesis of various metalloporphyrins has been developed from pyrrole and substituted aldehydes using transition metal salts. This method allows higher working concentrations than those previously reported. Along with the reported metalloporphyrins, some new metalloporphyrins were synthesized in good yield.     

One-pot regioselective synthesis of dihydronaphthofurans and dibenzofurans

A regioselective approach for the synthesis of substituted naphthofurans and dibenzofurans has been demonstrated through a ring transformation reaction of suitably functionalized 2H-pyran-2-ones by reaction with 6,7-dihydro-5H-benzofuran-4-one and 7-methoxybenzofuran-3-one, respectively, in high yields. The novelty of the procedure lies in the creation of an aromatic ring transformed by 2H-pyran-2-one involving the -COCH₂- moiety of a cyclic ketone.     

One-pot synthesis of MWW zeolite nanosheets using a rationally designed organic structure-directing agent

A new material MIT-1 comprised of delaminated MWW zeolite nanosheets is made in a one-pot synthesis using a rationally designed organic structure-directing agent (OSDA). The OSDA consists of a hydrophilic head segment that resembles the OSDA used to synthesize the zeolite precursor MCM-22(P), a hydrophobic tail segment that resembles the swelling agent used to swell MCM-22(P), and a di-quaternary ammonium linker that connects both segments. MIT-1 features high crystallinity and surface areas exceeding 500 m² g^–1, and can be synthesized over a wide synthesis window that includes Si/Al ratios ranging from 13 to 67. Characterization data reveal high mesoporosity and acid strength with no detectable amorphous silica phases. Compared to MCM-22 and MCM-56, MIT-1 shows a three-fold increase in catalytic activity for the Friedel–Crafts alkylation of benzene with benzyl alcohol.     

One-pot synthesis of multisubstituted quaterphenyls and cyclopropanes

An efficient one-step synthetic route toward multifunctionalized quaterphenyls 3 or cyclopropanes 4 is developed from substituted chalcones 1 and sulfones 2 in good yields via a regioselective [3C+3C] or [1C+2C] annulation. The reaction features mild conditions, multisubstitution, and functional groups tolerance and is transition metal catalyst-free. The protocol provides a novel alternative to the conventional methodologies for the synthesis of quaterphenyls or cyclopropanes.     

One-pot synthesis of new aza- and diaza-aminophenanthrenes

The synthesis of a series of benzo(iso)quinoline and phenanthroline derivatives has been achieved using an efficient one-pot procedure. It proceeds through a Suzuki-Miyaura cross-coupling followed by a Dieckmann-Thorpe ring closure under microwave irradiation and provides easy access to building blocks not readily available through other methods.