Remote Regioselective Radical C–H Functionalization of Unactivated C–H Bonds in Amides: The Synthesis of <i>gem</i>-Difluoroalkenes
作者:Qu-Ping Hu、Jing Cheng、Ying Wang、Jie Shi、Bi-Qin Wang、Ping Hu、Ke-Qing Zhao、Fei Pan
DOI:10.1021/acs.orglett.1c01385
日期:2021.6.4
The site-selective functionalization of unactivated aliphatic amines is an attractive and challenging synthetic approach. We herein report a general strategy for the remote site-selective functionalization of unactivated C(sp3)–H bonds in amides by photogenerated amidyl radicals to form gem-difluoroalkenes with trifluoromethyl-substituted alkenes. The site selectivity is controlled by a 1,5-hydrogen
Anti-inflammatory Constituents of the Red Alga <i>Gracilaria verrucosa</i> and Their Synthetic Analogues
作者:Hung The Dang、Hye Ja Lee、Eun Sook Yoo、Pramod B. Shinde、Yoon Mi Lee、Jongki Hong、Dong Kyoo Kim、Jee H. Jung
DOI:10.1021/np070452q
日期:2008.2.1
A chemical study on the anti-inflammatory components of the red alga Gracilaria verrucosa led to the isolation of new 11 -deoxyprostaglandins (1-4), a ceramide (5), and a C-16 keto fatty acid (6), along with known oxygenated fatty acids (7-14). Their structures were elucidated on the basis of NMR and MS data. The absolute configurations of compounds 1-5 were determined by Mosher's method. The anti-inflammatory activity of the isolated compounds (1-14) was evaluated by determining their inhibitory effects on the production of pro-inflammatory mediators (NO, IL-6, and TNF-alpha) in lipopolysaccharide (LPS)-activated RAW 264.7 murine macrophage cells. Compounds 9 and 10 exhibited the most potent activity. In the evaluation of these two compounds and derivatized analogues (15-40), the anti-inflammatory activity was enhanced in some synthetic analogues. These enone fatty acids were investigated as potential anti-inflammatory leads for the first time.