A trisulfur-radical-anion (S3̇–)-triggered C(sp2)–H
amination of α,β-unsaturated
carbonyl derivatives with simple amines has been demonstrated. This
protocol provides convenient access to a variety of synthetically
valuable N-unprotected and secondary β-enaminones with absolute
Z selectivity and tertiary β-enaminones with E selectivity.
Mechanistic probe and electronic structure theory calculations suggest
that S3̇– initiates the nucleophilic
attacks via a thiirane intermediate.
Person Re-Identification problem aims at matching people across a network of non-overlapping cameras. When multiple probe people appear concurrently, human could compare them together to give a more accurate matching. However, existing approaches treat each probe person independently, skipping the concurrent information. In this paper, we propose a re-ranking method which utilize that kind of information to refine ranked lists produced by any person re-identification method to create more precise ranked lists. The experimental results on VIPeR dataset show the improved performance when our method is applied.
An efficient metal-free synthesis of 2,4-substituted quinazolines via a hydrogen peroxide-mediated one-pot three-component reaction of 2-aminoaryl ketones, aldehydes, and ammonium acetate has been developed.
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