Two new species of the genus Tautoneura Anufriev from Karst area in Southwest China (Hemiptera: Cicadellidae: Typhlocybinae).

Two new species of the leafhopper genus Tautoneura Anufriev from Karst areas in Southwest China are described and illustrated, Tautoneura aureomarginalis sp. nov. and Tautoneura lageniformis sp.

An unusual case of neurocardiogenic syncope: A case report and systematic review.

We present a case of syncopal episode in emergency department (ED) and subsequent admission to the geriatric assessment unit. The patient presented with self-limiting central abdominal pain. Given a history of previous aortic aneurysm repair, a contrast CT angiogram was performed.

Synthesis of Highly Substituted Pyridines through Copper-Catalyzed Condensation of Oximes and α,β-Unsaturated Imines.

A copper-catalyzed condensation reaction of oxime acetates and α,β-unsaturated ketimines to give pyridine derivatives is reported. The reaction features mild conditions, high functional-group compatibility, and high regioselectivity with respect to unsymmetrical oxime acetates, thus allowing the preparation of a wide range of polysubstituted pyridines, many of which are not readily accessible by conventional condensation methods.

Copper-Catalyzed Coupling of 2-Siloxy-1-alkenes and Diazocarbonyl Compounds: Approach to Multisubstituted Furans, Pyrroles, and Thiophenes.

We report herein copper(II)-catalyzed cyclization reactions of silyl enol ethers derived from methyl ketones with α-diazo-β-ketoesters or α-diazoketones to afford 2-siloxy-2,3-dihydrofuran derivatives or 2,3,5-trisubstituted furans, respectively, under mild conditions. The former cyclization products serve as versatile 1,4-diketone surrogates, allowing facile preparation of 2,3,5-trisubstituted furans, pyrroles, and thiophenes.

Copper-catalyzed condensation of imines and α-diazo-β-dicarbonyl compounds: modular and regiocontrolled synthesis of multisubstituted pyrroles.

In the presence of a copper(ii) catalyst, enolizable imines bearing various -substituents and α-diazo-β-ketoesters undergo denitrogenative and dehydrative condensation to afford highly substituted pyrroles in moderate to good yields with exclusive regioselectivity. The reaction likely involves nucleophilic addition of the imine nitrogen to a copper carbenoid, tautomerization of the resulting azomethine ylide to an α-enaminoketone, and a subsequent enamine-ketone cyclocondensation. With Yb(OTf) as a unique cocatalyst, α-diazo-β-diketones also participate in the same condensation reaction.