Mutual Activation: Suzuki-Miyaura Coupling through Direct Cleavage of the sp2 CO Bond of Naphtholate
作者:Da-Gang Yu、Zhang-Jie Shi
DOI:10.1002/anie.201101461
日期:2011.7.25
Working together: A new approach of mutualactivation between naphtholates and aryl boronic acid derivatives by the formation of borates to facilitate the Suzuki–Miyauracouplingthroughdirectcleavage of the sp2CObond by nickel catalysis is described (see scheme; R′: annulated ring system). Various naphtholates and aryl boronic acid derivatives could be directly coupled in good yields.
CF<sub>3</sub>SO<sub>2</sub>Na-Mediated Five-Component Carbonylation of Triarylboroxines with TMSCF<sub>3</sub> and THF/LiOH/NaI to Give Aroyloxyalkyl Iodides
efficient and transition-metal-free multicomponent coupling reaction for the synthesis of aroyloxyl alkyliodides. In the reaction among 2,4,6-triarylboroxines, THF, TMSCF3, LiOH, and NaI, five-component reactions could be precisely controlled by modulating CF3SO2Na, supplying one type of aroyloxyl alkyliodides in moderate to high yields. The reaction exhibits good functional group tolerance and a wide substrate
在此,我们开发了一种高效且不含过渡金属的多组分偶联反应,用于合成芳酰氧基烷基碘。在2,4,6-三芳基环硼氧烷、THF、TMSCF 3 、LiOH和NaI的反应中,通过调节CF 3 SO 2 Na可以精确控制五组分反应,提供一种中高产率的芳酰氧基烷基碘. 该反应表现出良好的官能团耐受性和广泛的底物范围,可以很容易地转化为其他有用的化合物。该机制是在控制实验的基础上提出的
Biaryl Construction via Ni-Catalyzed C−O Activation of Phenolic Carboxylates
作者:Bing-Tao Guan、Yang Wang、Bi-Jie Li、Da-Gang Yu、Zhang-Jie Shi
DOI:10.1021/ja8056503
日期:2008.11.5
Biaryl scaffolds were constructed via Ni-catalyzed aryl C-O activation by avoiding cleavage of the more reactive acyl C-O bond aryl carboxylates. Now aryl esters, in general, can be successfully employed in cross-coupling reactions for the first time. The substrate scope and synthetic utility of the chemistry were demonstrated by the syntheses of more than 40 biaryls and by constructing complex organic molecules. Water was observed to play an important role in facilitating this transformation.