Copper-Catalyzed Radical Cascade Cyclization of -Substituted Indole-3-Aldehydes with Aryl Alkenes: Access to Pyrrolo[1,2-]indole Scaffolds.

Herein, we report a Cu-DTBP-catalyzed [3 + 2] cycloaddition reaction between 1-(2-oxo-2-phenylethyl)--indole-3-aldehyde and arylalkene, using DMF as the solvent. Under relatively mild reaction conditions, a series of indole compounds were synthesized in moderate yields (up to 73%). This protocol features good functional group tolerance and high atom economy.

Iron(II)-Catalyzed Synthesis of Nitrated Dihydropyrazole via a Nitrification and C-H Activation/Cyclization Cascade Reaction.

A route for nitrification and C-H activation/cyclization of ()--allyl-'-benzylidenebenzenesulfonohydrazide and cobalt nitrate via an iron(II)-catalyzed cascade reaction to synthesize nitrated dihydropyrazoles has been developed. The method features convenient operation and good functional group tolerance. In addition, it employs insensitive and inexpensive FeSO as the catalyst and provides a direct approach for the preparation of dihydropyrazoles.

Azimuth-Resolved Circular Dichroism of Metamaterials.

Chiral optical metamaterials have attracted a great deal of attention due to their intriguing properties with respect to fundamental research and practical applications. For metamaterials with achiral structures, the system composed of metamaterials and obliquely incident light has extrinsic chirality and can produce circular dichroism (CD) effect. However, there have been few studies on the azimuth-dependent CD spectra of achiral metamaterials that have greatly improved our understanding of optical phenomena caused by external chirality.

A Fast Stereo Matching Network with Multi-Cross Attention.

Stereo matching networks based on deep learning are widely developed and can obtain excellent disparity estimation. We present a new end-to-end fast deep learning stereo matching network in this work that aims to determine the corresponding disparity from two stereo image pairs. We extract the characteristics of the low-resolution feature images using the stacked hourglass structure feature extractor and build a multi-level detailed cost volume.

Angular-dependent circular dichroism of Tai Chi chiral metamaterials in terahertz region.

Chirality has received wide attention due to its promising applications in biopharmaceuticals, chemical detection, and polarized optoelectronic devices. Herein, metamaterials with layered Tai Chi patterns are proposed to get strong and tunable chirality. Based on the surface current distribution analysis, a coupling model considering both the magnetic and electric dipoles in the upper and bottom metallic structures is proposed to understand the circular dichroism.

Angular dependent strong coupling between localized waveguide resonance and surface plasmon resonance in complementary metamaterials.

We give direct evidence of both surface plasmon resonance (SPR) and localized waveguide resonance (LWR) contribution to the extraordinary optical transmission in complementary metamaterials. Strong coupling between SPR and LWR are also observed with clear evidence of Rabi splitting and anti-crossing phenomena. The splitting introduces sharp phase shift, which in turn enhances group velocity delay by the incident angle without geometric parameter change.