Palladium-catalysed vinylation of organic halides under solid–liquid phase transfer conditions
作者:Tuyet Jeffery
DOI:10.1039/c39840001287
日期:——
Heck-type reactions involving organichalides proceed readily at or near room temperature when performed undersolid–liquidphasetransferconditions.
当在固液相转移条件下进行时,涉及有机卤化物的Heck型反应很容易在室温下或接近室温下进行。
Catalytic Coupling between Unactivated Aliphatic C–H Bonds and Alkynes via a Metal–Hydride Pathway
作者:Yan Xu、Michael C. Young、Guangbin Dong
DOI:10.1021/jacs.7b02020
日期:2017.4.26
We report a Rh(I)-catalyzed site-selective coupling between ketone β-C(sp3)-H bonds and aliphatic alkynes using an in situ-installed directing group. Upon hydrogenation or hydration, various β-alkylation or β-aldol products of the ketones are obtained with broad functional group tolerance. Mechanistic investigations support the involvement of a Rh-H intermediate through oxidative addition of Rh(I)
[RuCl<sub>2</sub>(<i>p-</i>cymene)]<sub>2</sub>-Catalyzed Conjugate Addition of Arylboronic Acids to α,β-Unsaturated Ketones under Ligand-Free and Neutral Conditions
作者:Lei Zhang、Xiaomin Xie、Lei Fu、Zhaoguo Zhang
DOI:10.1021/jo4001367
日期:2013.4.5
A simple and efficient Ru-catalyzed conjugate addition reaction of arylboronic acids to α,β-unsaturated ketones under neutral conditions without any additional ligands has been developed. This Ru(II)-catalytic system both fulfilled the inhibition of the β-hydride elimination in the catalytic cycle and minimized the protonolysis of arylboronic acids.
A method for conveniently preparing 2,2-dichloro-12-(4-chlorophenyl)-10-hydroxydodecanoic acid useful as an active ingredient of therapeutic agents for diseases such as diabetes at a high yield, which comprises the step of reacting a compound represented by the following general formula (A):
wherein X represents a halogen atom, and a compound represented by the following general formula (B): CHCl
2
COOR
1
wherein R
1
represents hydrogen atom or a protective group of carboxyl group, to prepare a compound represented by the following general formula (C):
wherein R
1
has the same meaning as that defined above.