Phenazinium Salt-Catalyzed Aerobic Oxidative Amidation of Aromatic Aldehydes
作者:Dasheng Leow
DOI:10.1021/ol5029354
日期:2014.11.7
Amides are prevalent in organic synthesis. Developing an efficientsynthesis that avoids expensive oxidants and heating is highly desirable. Here the oxidativeamidation of aromaticaldehydes is reported using an inexpensive metal-free visible light photocatalyst, phenazine ethosulfate, at low catalytic loading (1–2 mol %). The reaction proceeds at ambient temperature and uses air as the sole oxidant
Development of a Rhodium(II)-Catalyzed Chemoselective C(sp<sup>3</sup>)H Oxygenation
作者:Yun Lin、Lei Zhu、Yu Lan、Yu Rao
DOI:10.1002/chem.201502140
日期:2015.10.12
We report the first example of RhII‐catalyzed chemoselective double C(sp3)Hoxygenation, which can directly transform various toluene derivatives into highly valuable aromatic aldehydes with great chemoselectivity and practicality. The critical combination of catalyst Rh(OAc)2, oxidant Selectfluor, and solvents of TFA/TFAA promises the successful delivery of the oxidation with satisfactory yields
cyclopentadienyl (Cp)-Rh(III) complex, bearing ester and pendant amide moieties on the Cpring [CpARh(III)], is able to catalyze the aerobic oxidative olefination of benzamides, bearing nonspecial carbamoyl groups, with styrenes including disubstituted ones at relatively low temperature (60–80 °C). The presence of both the ester and pendant acidic N-phenylcarbamoyl moieties on the CpA ligand play important
已经确定,新开发的中等电子缺陷的环戊二烯基(Cp)-Rh(III)配合物在Cp环[Cp A Rh(III)]上带有酯和侧基酰胺部分,能够催化好氧氧化烯化反应带有非特殊氨基甲酰基基团的苯甲酰胺,在相对较低的温度(60–80°C)下含苯乙烯,包括二取代的苯甲酰胺。Cp A配体上的酯和酸性N-苯基氨基甲酰基侧基的存在在促进催化的过程中起着重要作用,同时又不影响配合物的热稳定性。