Ligand-Free Iridium-Catalyzed Dehydrogenative <i>ortho</i>
C−H Borylation of Benzyl-2-Pyridines at Room Temperature
作者:Yuhuan Yang、Qian Gao、Senmiao Xu
DOI:10.1002/adsc.201801292
日期:2019.2.19
A convenient and ligand‐free iridium‐catalyzed dehydrogenative orthoC−Hborylation of benzyl‐2‐pyridines has been developed. The reaction proceeds smoothly at room temperature using pinacolborane as a borylating reagent in the presence of catalytic amount of [IrOMe(COD)]2. The reaction is compatible with many functional groups, providing a vast array of ortho borylated products in moderate to excellent
Lewis Acid Promoted Benzylic Cross-Couplings of Pyridines with Aryl Bromides
作者:Stéphanie Duez、Andreas K. Steib、Sophia M. Manolikakes、Paul Knochel
DOI:10.1002/anie.201103074
日期:2011.8.8
Either ZnCl2, Sc(OTf)3 , or BF3⋅OEt2 can promote the palladium‐catalyzed arylation of methylpyridines and related heterocycles (see example). The complexation of the Lewisacid to the nitrogen atom in the heterocycle facilitates the reductive elimination, leading to various arylated pyridines in high yields. BF3⋅OEt2 was also found to promote highly regioselective metalations in the case of 2,4‐lutidine
Visible-light-induced cross-coupling of aryl iodides with hydrazones <i>via</i> an EDA-complex
作者:Pan Pan、Shihan Liu、Yu Lan、Huiying Zeng、Chao-Jun Li
DOI:10.1039/d2sc01909d
日期:——
photosensitizer-free cross-coupling of aryl iodides with hydrazones was developed. In this strategy, hydrazones were used as alternatives to organometallic reagents, in the absence of a transition metal or an external photosensitizer, making this cross-coupling mild and green. The protocol was compatible with a variety of functionalities, including methyl, methoxy, trifluoromethyl, halogen, and heteroaromatic