Oxidative dehydrogenative [2 + 3]-cyclization of glycine derivatives with N-sulfonylaziridines is described. A series of complex imidazolidines were produced under mild and simple reaction conditions. A mechanism involving an unusual acid-promoted auto-oxidation is proposed.

A high oxygen content can lead to metallurgical defects such as holes and microcracks in the products of selective laser melting (SLM) that significantly reduce the density and mechanical properties of a denture. In this study, a batch of a Co-Cr alloy powder was subjected to forced oxidation. SLM was used to prepare specimens from the powder before and after the treatment for the performance tests. The results showed that Co-Cr alloy powders with oxygen contents 184 and 616 ppm could both achieve good shaping of the specimens under identical SLM conditions. There was no significant difference between the specimens in terms of fuselage morphology, microstructure, density, tensile strength, yield strength and hardness. However, the elongation of the alloy synthesised using the higher oxygen content powder was significantly lowered, but still higher than that required by the ASTM F75 Casting Standard of the United States.

Cumene promoted auto-oxidation involved tandem radical cyclization of N-methacryloyl benzamides using CBr4 as the bromine source to construct brominated isoquinolinediones is described.

The auto-oxidative Povarov/aromatization tandem reaction of N-aryl glycine derivatives with enamides yields a series of complex quinoline derivatives in good yields. The reactions are performed using only catalytic amount of Brønsted acid and O 2 . The acylamino group is used as both activating and leaving group to improve the reaction efficiency in this transformation.

A facile and efficient aerobic oxidative (4 + 2)-cyclization/aromatization/lactonization tandem reaction of N-aryl glycine esters with propargyl alcohols to access quinoline-fused lactones is reported. The reaction can be extended to homopropargylic alcohols too. The transformation is straightforward to perform under mild conditions and scalable, and both reaction components are readily available.