Design,synthesis and insecticidal activity of spiro heterocycle containing neonicotinoid analogs

Spiro heterocycles frequently occur in bioactive molecules. In the pursuit of neonicotinoids with spiro hererocycles, three types of novel neonicotinoids with spirobenzofuranone, spirooxindole or spiroacenaphythylenone framework were designed and synthesized. Insecticidal evaluation showed that some of spirobenzofuranone containing neonicotinoids exhibited moderate activity against cowpea aphid, armyworm or brown planthopper.     

Water-Accelerated Selective Synthesis of 1,2-Disubstituted Benzimidazoles at Room Temperature Catalyzed by Br⊘nsted Acidic Ionic Liquid

An environmentally benign method for the rapid and selective synthesis of 2-aryl-1-arylmethyl-1H-1,3-benzimidazoles by the reaction of o-phenylenediamines and aromatic aldehydes in the presence of 1-methylimidazolium triflouroacetate ([Hmim]TFA) at room temperature under aqueous conditions is described. The ionic liquid is reusable and could be recycled for several runs without any decrease in its efficiency.     

Efficient and Short Route for the Regioselective Synthesis of Highly Substituted,Angularly Fused Furano-, Pyrano-, and Pyrrolocoumarin/Quinolone Derivatives by Metal-Mediated Cyclization

A one-step efficacious method for the construction of a variety of substituted furano-, pyrano-, and pyrrolocoumarins and pyrroloquinolones in good to excellent yields has been developed.     

New Procedure for One‐Pot Synthesis of 3,4‐Dihydropyrimidin‐2(1H)‐ones by Biginelli Reaction

A practical green chemistry procedure for synthesis of 3,4‐dihydropyrimidin‐2(1H);‐ones in good yields was successfully carried out in micellar systems according to the Biginelli reaction using β‐ketoester, urea and appropriate aromatic aldehyde in the presence of CuCl₂ · H₂O as catalyst. The advantages of this method involved the broader application scope of substrates, the more environmental friendly process and the low‐cost of the Lewis acid catalyst.     

Rhodium(III)-catalyzed C–H functionalization of C-alkenyl azoles with sulfoxonium ylides for the synthesis of bridgehead N-fused [5,6]-bicyclic heterocycles

The synthesis of bridgehead N-fused [5,6]-bicyclic heterocycles via rhodium(III)-catalyzed C–H functionalization of C-alkenyl azoles with sulfoxonium ylides is disclosed. Reactions proceeded in good to high yields for a range of aryl, heteroaryl and alkyl sulfoxonium ylides. In addition, 2-alkenyl imidazoles with different substitution patterns as well as C-alkenyl triazoles were effective inputs. The reaction could also be performed under straightforward bench top conditions.     

Synthesis,Crystal Structure and Cytotoxicity Evaluation of 2-Phenoxy-4H-spiro{naphtho[2,3-e][1,4,2] oxazaphosphinane-5,10-dione,1'-cyclohexane} 2-Oxide

1 INTRODUCTION The quinone structure is common in numerous natural products that are associated with antitumor, antibacterial, antimalarial, and antifungal activities[1]. A variety of heterocyclic quinones containing dif- ferent heteroatom substituents could exhibit such activities through different actions and sometimes even improve the activities[2～5]. On the other hand, organophosphorus compounds continue to receive widespread attention due to their ubiquity in biological systems[6, 7]…     

3,6‐Dinitropyrazolo[4,3‐c]pyrazole‐Based Multipurpose Energetic Materials through Versatile N‐Functionalization Strategies

A family of 3,6‐dinitropyrazolo[4,3‐c]pyrazole‐based energetic compounds was synthesized by using versatile N‐functionalization strategies. Subsequently, nine ionic derivatives of the N,N′‐(3,6‐dinitropyrazolo[4,3‐c]pyrazole‐1,4‐diyl)dinitramidate anion were prepared by acid‐base reactions and fully characterized by infrared, multinuclear NMR spectra, and elemental analysis. The structures of four of these compounds were further confirmed by single‐crystal X‐ray diffraction. Based on their different physical and detonation properties, these compounds exhibit promising potential as modern energetic materials and can be variously classified as green primary explosives, high‐performance secondary explosives, fuel‐rich propellants, and propellant oxidizers.     

Asymmetric flavone-based liquid crystals: synthesis and properties

A series of flavones (n-F) substituted at the 4′, and 6 positions was prepared, characterised by NMR (¹H,¹³C), HRMS, and studied for liquid crystal properties. The 4′-alkoxy,6-methoxyflavones (4-F–16-F) exhibit varying ranges of nematic and smectic A phases as evidenced by polarised optical microscopy and differential scanning calorimetry (DSC). As the tail length is increased, the smectic phase becomes more prevalent. Smectic phases for (8-F–16-F) were further analysed by powder X-ray diffraction (XRD), and the rate of structural transformations was explored by combined DSC/XRD studies. Flavonol 6-F–OH was also prepared but no mesogenic behaviour was observed. The molecular structures of 6-F and 6-F–OH were determined by single-crystal XRD and help to explain the differences in material properties. Additionally, fluorescence and electrochemical studies were conducted on solutions of n-F.     

A NOVEL ROUTE TO SPIRO PHOSPHORUS-HETEROCYCLE VIA LAWESSON'S REAGENT

ABSTRACT

2-Aryl-spiro-[5,5]-1,3,2-dioxaphosphorinane-2-sufides were prepared by the cyclization reaction of Lawesson's reagent with pentaerythritol and monobenzalpentaerythritol, respectively.     

Efficient Synthesis of Chiral 1,1′‐Sulfonyl Bisaziridines

An efficient three‐step synthesis of chiral 1,1′‐(sulfonyl)bisaziridines is described. Preparation of these compounds was carried out easily starting from N,N′‐sulfonyl bis‐(α‐L‐aminoester) to afford the title compounds in very good yields. These 1,1′‐(sulfonyl)bisaziridines can constitute interesting synthetic building blocks.