Bis(amidate)bis(amido) Titanium Complex: A Regioselective Intermolecular Alkyne Hydroamination Catalyst
作者:Jacky C.-H. Yim、Jason A. Bexrud、Rashidat O. Ayinla、David C. Leitch、Laurel L. Schafer
DOI:10.1021/jo402668q
日期:2014.3.7
o) titanium precatalyst for the anti-Markovnikov hydroamination of alkynes is reported. Hydroamination of terminal and internal alkynes with primary alkylamines, arylamines, and hydrazines is promoted by 5–10 mol % of Ti catalyst. Various functional groups are tolerated including esters, protected alcohols, and imines. The in situ generated complex shows comparable catalytic activity, demonstrating
Anti-Markovnikov Addition of Both Primary and Secondary Amines to Terminal Alkynes Catalyzed by the TpRh(C<sub>2</sub>H<sub>4</sub>)<sub>2</sub>/PPh<sub>3</sub> System
Terminal alkynes react with secondaryamines in the presence of TpRh(C2H4)2/PPh3 (Tp = trispyrazolylborate) to give anti-Markovnikov E-enamines. Both Tp and PPh3 ligands are essential for the reaction. The reaction tolerates functional groups, such as ester, nitrile, and siloxy groups, on the terminal alkynes. Primaryamines also add to terminal alkynes in anti-Markovnikov fashion, yielding the corresponding
Disclosed herein are secondary amine compounds that inhibit tRNA synthetase. The compounds of the invention are useful in inhibiting tRNA synthetase in Gram-negative bacteria and are useful in killing Gram-negative bacteria. The secondary amine compounds of the invention are also useful in the treatment of tuberculosis.
Anti-Markovnikov Intermolecular Hydroamination: A Bis(amidate) Titanium Precatalyst for the Preparation of Reactive Aldimines
作者:Zhe Zhang、Laurel L. Schafer
DOI:10.1021/ol0359214
日期:2003.11.1
[reaction: see text] A bulky bis(N-2',6'-diisopropylphenyl(phenyl)-amidate)titanium-bis(diethylamido) complex was identified as a highly active and regioselective precatalyst for the anti-Markovnikovhydroamination of a wide range of terminal alkyl alkynes with alkylamines. This titanium complex was fully characterized, including its X-ray crystal structure. The reactive aldimine products generated