Pd‐Senphos Catalyzed
<i>trans</i>
‐Selective Cyanoboration of 1,3‐Enynes
作者:Yuanzhe Zhang、Bo Li、Shih‐Yuan Liu
DOI:10.1002/anie.202005882
日期:2020.9.7
The first trans‐selective cyanoboration reaction of an alkyne, specifically a 1,3‐enyne, is described. The reported palladium‐catalyzed cyanoboration of 1,3‐enynes is site‐, regio‐, and diastereoselective, and is uniquely enabled by the 1,4‐azaborine‐based Senphos ligand structure. Tetra‐substituted alkenyl nitriles are obtained providing useful boron‐dienenitrile building blocks that can be further
Shuffle off the classic β-Si elimination by Ni-NHC cooperation: implication for C–C forming reactions involving Ni-alkyl-β-silanes
作者:Chun-Yu Ho、Lisi He
DOI:10.1039/c1cc14593b
日期:——
Via a cooperation of NHC, Si substituents and a M center, β-Si elimination was attenuated, revealing a new way to attain a high Ni-β-SiR3â:âNi-Ï-SiR3 ratio. The scope is illustrated by a head-to-tail vinylsilane-α-olefin hydroalkenylation.
Tandem Brønsted Acid Promoted and Nazarov Carbocyclizations of Enyne Acetals to Hydroazulenones
作者:Luz Escalante、Carlos González-Rodríguez、Jesús A. Varela、Carlos Saá
DOI:10.1002/anie.201205823
日期:2012.12.3
Ring the changes: Enyne acetals were easily converted into hydroazulene skeletons by a new and efficient metal‐free route involving a Brønsted acid promoted carbocyclization and a subsequent stereospecific Nazarov cyclization (see scheme). The versatility of this transformation also allowed assembly of interesting heteroaromatic tricyclic systems.
Use of cyclosporin alkyne analogues for preventing or treating viral-induced disorders
申请人:Molino F. Bruce
公开号:US20070232530A1
公开(公告)日:2007-10-04
The present invention relates to methods of preventing or treating a mammal with a viral-induced disorder. The method involves administering to the mammal a therapeutically effective amount of a compound represented by Formnula I, as shown below:
or a pharmaceutically acceptable salt thereof, with X, R
0
, and R
1
defined herein, under conditions effective to prevent or treat the viral-induced disorder.
Various substituted bis-(aryl)manganese species were preparedfrom aryl bromides by one-pot insertion of magnesium turnings in the presence of LiCl and in situ trans-metalation with MnCl2 in THF at −5 °C within 2 h. These bis-(aryl)manganese reagents undergo smooth iron-catalyzed cross-couplings using 10 mol% Fe(acac)3 with various functionalized alkenyl iodides and bromides in 1 h at 25 °C. The aryl-alkenyl