Pd(II)-Catalyzed Enantioselective C–H Activation/C–O Bond Formation: Synthesis of Chiral Benzofuranones
摘要:
Pd(II)-catalyzed enantioselective C-H activation of phenylacetic acids followed by an intramolecular C-O bond formation afforded chiral benzofuranones. This reaction provides the first example of enantioselecctive C-H functionalizations through Pd(II)/Pd(IV) redox catalysis.
Pd(II)-Catalyzed Enantioselective C–H Activation/C–O Bond Formation: Synthesis of Chiral Benzofuranones
摘要:
Pd(II)-catalyzed enantioselective C-H activation of phenylacetic acids followed by an intramolecular C-O bond formation afforded chiral benzofuranones. This reaction provides the first example of enantioselecctive C-H functionalizations through Pd(II)/Pd(IV) redox catalysis.
Highly dispersed potassium on alumina (K/Al2O3) acts as a metalatingagent towards enolizable compounds and the intermediate organopotassium derivatives can be alkylated with primary alkyl bromides. The reaction conditions are dependent on the substrate. In particular, tetrahydrofuran is the solvent of choice for the metalation of nitriles and aldehydeN,N-dimethylhydrazones at −60°C and of N-cyclohexyl
氧化铝上高度分散的钾(K / Al 2 O 3)作为可烯醇化化合物的金属化剂,中间有机钾衍生物可以用伯烷基溴化物烷基化。反应条件取决于底物。特别地,四氢呋喃是在-60℃下腈和醛N,N-二甲基hydr和N-环己基酮亚胺在室温下金属化的选择的溶剂,而己烷必须用于酮。
Potassium-graphite (C8K) as a metallation reagent. Alkylation of nitriles and esters with alkyl halides under heterogeneous conditions