Amination of Aryl Boronic Acids with Alkylnitrites: A Convenient Complement to Cu-Promoted Reductive Amination
作者:Oleg A. Levitskiy、Tatiana V. Magdesieva
DOI:10.1021/acs.orglett.9b03961
日期:2019.12.20
Copper-catalyzedamination of arylboronic acids with alkylnitrites leading to symmetrical diarylamines with a practical 50-80% yield was elaborated. Two C(sp2)-N bonds are formed in the one-pot process under mild conditions. This new approach to diarylamines is a complement to the Cu-assisted reductive amination of arylboronic acids avoiding preliminary synthesis of nitrosoarenes. The possible reaction
Susceptibility to metabolism is a common issue with the tert-butyl group on compounds of medicinal interest. We demonstrate an approach of removing all the fully sp(3) C-Hs from a tert-butyl group: replacing some C-Hs with C-Fs and increasing the s-character of the remaining C-Hs. This approach gave a trifluoromethylcyclopropyl group, which increased metabolic stability. Trifluoromethylcyclopropyl-containing analogues had consistently higher metabolic stability in vitro and in vivo compared to their tert-butyl-containing counterparts.
[EN] MACROCYCLIC BROAD SPECTRUM ANTIBIOTICS<br/>[FR] ANTIBIOTIQUES MACROCYCLIQUES À LARGE SPECTRE
申请人:GENENTECH INC
公开号:WO2020243155A1
公开(公告)日:2020-12-03
Provided herein are antibacterial compounds, wherein the compounds in some embodiments have broad spectrum bioactivity. In various embodiments, the compounds act by inhibition of bacterial type 1 signal peptidases SpsB and/or LepB, an essential protein in bacteria. Pharmaceutical compositions and methods for treatment using the compounds described herein are also provided.
Chameleonic Behavior of the α‐Methylcyclopropyl Group and Its Through‐Space Interactions: A Route to Stabilized Three Redox States in Diarylnitroxides
作者:Oleg A. Levitskiy、Dmitry A. Dulov、Alexey V. Bogdanov、Yury K. Grishin、Sergey E. Nefedov、Tatiana V. Magdesieva
DOI:10.1002/chem.202000165
日期:2020.5.26
oxoammonium cations and aminoxyl anions. DFT investigation of the electronic structure and geometry of the compounds confirmed conformational switching of the cyclopropyl orientation relatively to the adjacent aromatic π-system as dependent on the nitroxide's redox state. Additional through-space stabilizing interaction between the π-acceptor orbital of the NO + moiety and the cyclopropyl "banana" bond