Palladium-Catalyzed Divergent Arylation with Triazolopyridines: One-Pot Synthesis of 6-Aryl-2-α-styrylpyridines
作者:Youngtaek Moon、Soonhyung Kwon、Dahye Kang、Honggu Im、Sungwoo Hong
DOI:10.1002/adsc.201500967
日期:2016.3.17
We have developed a new strategy for palladium‐catalyzed arylation reactions with triazolopyridines, wherein two different chemical transformations (C‐3 vs. C‐7) are observed by differentiating the substrates using different bases. The reactive palladium carbenoids were directly generated from triazolopyridines and underwent denitrogenative arylations with aryl bromides. Intriguingly, when potassium
The direct alpha-methylenation of benzylpyridines was achieved using N,N-dimethylacetamide (DMA) as a one-carbon source under copper catalysis. An intermediary species was detected at an early stage, and a possible mechanism was proposed. Additionally, alpha-oxygenation and dimerization of benzylpyridines could also be performed efficiently.
Visible-light-mediated photoredox Giese reaction with α-branched 2-vinylpyridines and α-ketoacids