Biaryl Construction via Ni-Catalyzed C−O Activation of Phenolic Carboxylates
摘要:
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.
Identification and structure activity relationship of novel flavone derivatives that inhibit the production of nitric oxide and PGE 2 in LPS-induced RAW 264.7 cells
作者:Ji-Young An、Hwi-Ho Lee、Ji-Sun Shin、Hyung-Seok Yoo、Jong Seon Park、Seung Hwan Son、Sang Won Kim、Jihyun Yu、Jun Lee、Kyung-Tae Lee、Nam-Jung Kim
DOI:10.1016/j.bmcl.2017.03.057
日期:2017.6
In an effort to identify novel anti-inflammatory compounds, a series of flavone derivatives were synthesized and biologically evaluated for their inhibitory effects on the production of nitric oxide (NO) and prostaglandinE2 (PGE2), representative pro-inflammatory mediators, in LPS-induced RAW 264.7 cells. Their structure-activity relationship was also investigated. In particular, we found that compound
A versatile approach to flavones via a one-pot Pd(<scp>ii</scp>)-catalyzed dehydrogenation/oxidative boron-Heck coupling sequence of chromanones
作者:Jun Lee、Jihyun Yu、Seung Hwan Son、Jinyuk Heo、Taelim Kim、Ji-Young An、Kyung-Soo Inn、Nam-Jung Kim
DOI:10.1039/c5ob01911g
日期:——
A variety of flavones were expediently synthesized from readily accessible chromanones via a one-pot sequence involving Pd(ii)-catalyzed dehydrogenation and oxidative boron-Heck coupling with arylboronic acid pinacol esters.