Palladium-Catalyzed Mono-α-Arylation of Acetone with Aryl Imidazolylsulfonates
作者:Lutz Ackermann、Vaibhav P. Mehta
DOI:10.1002/chem.201201394
日期:2012.8.13
Set the ace(tone): A palladium catalyst derived from the bidentate XantPhos ligand and Pd(OAc)2 has enabled broadly applicable mono‐α‐arylations of acetone to be performed with air‐ and moisture‐stable arylimidazolylsulfonates as most user‐friendly electrophiles (see scheme).
Palladium-Catalyzed Intermolecular Hydroamination of Alkynes: A Dramatic Rate-Enhancement Effect of <i>o</i>-Aminophenol
作者:Tomohiro Shimada、Yoshinori Yamamoto
DOI:10.1021/ja027683y
日期:2002.10.1
The hydroamination of alkynes using o-aminophenol proceeds in very high to good yields in the presence of Pd(NO3)2 catalyst. Remarkable rate enhancement with o-aminophenol is presumably due to the chelation effect of the ortho OH group to palladium.
Compounds having the formula: ##STR1## are selective antagonists of leukotrienes of D.sub.4 and inhibitors of the syntheses of LTA.sub.4, B.sub.4, C.sub.4, D.sub.4, E.sub.4, and F.sub.4. These compounds are useful as anti-asthmatic, anti-allergic, anti-inflammatory agents, and cytoprotective agents.
Bromine radical-enhanced HAT activity leading to stoichiometric couplings of methylarenes with acid chlorides
作者:Qiao-Lin Wang、Huawen Huang、Guojiang Mao、Guo-Jun Deng
DOI:10.1039/d2gc02972c
日期:——
The stoichiometric coupling of readily available methylarenes and diverse acid chlorides into α-aryl ketones, a valued structural motif present in pharmacologically relevant molecules, has been developed. The utility of this protocol is demonstrated by the late-stage acylation of biologically active molecules in a stoichiometric manner. Mechanistic investigation reveals that the photocatalytically