The invention provides compounds of formula (I) and salts thereof: R
1
-L-R
2
—B wherein R
1
, L, R
2
, and B have any of the values defined herein, as well as compositions comprising such compounds, and therapeutic methods comprising the administration of such compounds or salts. The compounds block siderophore production in bacteria and are useful as antibacterial agents.
on the VO(acac)(2)/TBHP (2 mol %/1.2 equiv) system. VO(acac)(2) first catalyzes the epoxidation of o-alkenyl phenols and then the rearrangement of the epoxyphenols to ketones via the selective benzylic C-O cleavage and 1,2 hydride migration. The protocol has also been applied to set up a useful and easy one-pot conversion of o-alkenyl phenols to benzo[b]furans by means of the sequential addition of
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-catalysed isomerization of terminal olefins
作者:He Wang、Fanwei Meng、Xin Tao
DOI:10.1039/d4nj00113c
日期:——
Selective isomerization of terminalolefins to afford new internal olefins is an atom economic reaction that is usually catalysed by metal catalysts. Here, we present a tris(pentafluorophenyl)borane [B(C6F5)3]-catalysed isomerization of olefins. Linear α-olefins are converted to 2-olefins in high yields with unsatisfactory stereoselectivity under the applied reaction conditions. At the same time, the
末端烯烃的选择性异构化以提供新的内烯烃是通常由金属催化剂催化的原子经济反应。在这里,我们提出了三(五氟苯基)硼烷[B(C 6 F 5 ) 3 ]催化的烯烃异构化。在所应用的反应条件下,直链 α-烯烃以高产率转化为 2-烯烃,但立体选择性不令人满意。同时,通过烯丙基苯的异构化可以获得具有高区域和立体选择性的生物相关的苯丙烯类产品。
Ruthenium-Catalyzed Olefin Cross Metathesis of Styrenes as an Alternative to the Heck and Cross-Coupling Reactions
作者:Arnab K. Chatterjee、F. Dean Toste、Tae-Lim Choi、Robert H. Grubbs
The use of olefin cross metathesis as a method for the formation of styrenyl-olefins is described using allylic substituted olefins and electron-deficient olefins. These methods provide an orthogonal method to alternative olefination strategies, such as the Heck reaction. These methods have also been employed in the total synthesis of 3-flavanols.