LiCl-Mediated Preparation of Functionalized Benzylic Indium(III) Halides and Highly Chemoselective Palladium-Catalyzed Cross-Coupling in a Protic Cosolvent
作者:Yi-Hung Chen、Mai Sun、Paul Knochel
DOI:10.1002/anie.200805588
日期:2009.3.9
Sensitive functional groups such as COR, CHO, or CH2OH can be present in benzylic indium reagents prepared by the direct insertion of indium in the presence of LiCl. These reagents undergo palladium‐catalyzed cross‐coupling reactions in the presence of a protic cosolvent after activation with iPrMgCl⋅LiCl (see scheme). Remarkable chemoselectivities are achieved by using various electrophiles containing
A class of pyrazole derivatives is described for use in treating p38 kinase medicated disorders. Compounds of particular interest are defined by Formula IA
wherein R
1
, R
2
, R
3
and R
4
are as described in the specification.
Large-Scale Preparation of Polyfunctional Benzylic Zinc Reagents by Direct Insertion of Zinc Dust into Benzylic Chlorides in the Presence of Lithium Chloride
作者:Paul Knochel、Albrecht Metzger、Christian Argyo
DOI:10.1055/s-0029-1217134
日期:2010.3
prepared by the direct insertion of commercially available zinc dust into the corresponding benzylic chlorides in the presence of stoichiometric amount of lithium chloride. These polyfunctional zinc organometallics react with variouselectrophiles leading to a broad range of functionalized products. insertion - zinc organometallics - zinc - benzylic zinc chlorides - lithium chloride