Secondary-sphere modification in proline catalysis: old friend, new connection
作者:Ido Domb、Danilo M. Lustosa、Anat Milo
DOI:10.1039/d1cc05589e
日期:——
reactivity and selectivity of amino catalysts. Herein, the carboxylic acid moiety of proline was targeted as a site for modification under catalytic reaction conditions with boronic acids. Intermolecular aldolreactions between aromatic aldehydes and cyclopentanone were selected as a proof-of-concept because cyclopentanone as an aldol donor was often associated with decreased selectivity compared to its
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
<i>α</i>‐C−H Arylation of <i>N</i>‐Sulfonyl Amines by Dual Palladium Catalysis
作者:Yu‐Cheng Liu、Hang Shi
DOI:10.1002/cctc.202300392
日期:2023.6.9
α-arylated amines from simple linear N-sulfonyl amines and aryl boroxines utilizing dual palladium catalysis involving amine dehydrogenation. Bromobenzene serves as a hydride acceptor, and the ensuing imineintermediate undergoes a novel umpolung arylation. Given the wide availability of primaryamines, this method can be expected to be useful for the synthesis of structurally complex amines with varied
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.