Enantioselective 1,4-Borylamination via Copper-Catalyzed Cascade Hydroborylation and Hydroamination of Arylidenecyclopropanes.

Compounds bearing both boryl and amino groups at distal positions are invaluable synthons for synthesizing pharmaceuticals, drug candidates, and natural products, but their catalytic enantioselective synthesis remains rarely explored. We report the first enantioselective 1,4-borylamination reaction through a copper-catalyzed cascade hydroborylation and hydroamination of arylidenecyclopropanes. This reaction combines four readily available components in a highly chemo-, site-, and enantioselective fashion (>20:1 r.

[Pathogens in bronchoalveolar lavage fluid of children with lower respiratory tract infection].

Objective: To study the features of pathogens in children with lower respiratory tract infection.

Methods: A total of 108 children who were hospitalized due to lower respiratory tract infection and underwent fiber bronchoscopy between January 2017 and June 2018 were enrolled. Bronchoalveolar lavage fluid samples were collected.