Facile synthesis of regio-isomeric naphthofurans and benzodifurans
作者:Kwanghee Koh Park、Jinsuk Jeong
DOI:10.1016/j.tet.2004.11.022
日期:2005.1
Naphtho[1,2-b]furans 1a–f, naphtho[2,1-b]furans 2a–f, benzo[1,2-b:5,4-b′]difurans 3a–b, benzo[1,2-b:4,5-b′]difurans 4a–b, and benzo[1,2-b:4,3-b′]difurans 5a–b were synthesized by base-catalyzed cyclization reaction of the corresponding o-alkoxybenzoylarene derivatives. The o-alkoxybenzoylarenes were obtained from the etherification reaction of the o-hydroxybenzoylarenes, which were prepared either
萘并[1,2- b ]呋喃1a - f,萘并[2,1- b ]呋喃2a - f,苯并[1,2- b:5,4- b ']双呋喃3a - b,苯并[1,通过相应的邻烷氧基苯并芳基芳烃的碱催化环化反应合成了2- b:4,5- b ']二呋喃4a - b和苯并[1,2- b:4,3- b ']二呋喃5a - b衍生品。该Øα-烷氧基苯甲酰基芳烃是由邻羟基苯甲酰基芳烃的醚化反应制得的,该反应是通过在氯化铝存在下甲氧基芳烃与苯甲酰氯的反应或通过芳基苯甲酸酯的光-弗里斯重排而制备的。
Anti-Influenza Drug Discovery: Structure−Activity Relationship and Mechanistic Insight into Novel Angelicin Derivatives
By using a cell-based high throughput screening campaign,a novel angelicin derivative 6a was identified to inhibit influenza A (H1N1) virus induced Cytopathic effect in Madin-Darby canine kidney cell culture in low micromolar range. Detailed structure-activity relationship studies of 6a revealed that the angelicin scaffold is essential for activity in pharmacophore B, while meta-substituted phenyl/2-thiophene rings are optimal ill pharmacophore A and C. The optimized lead 4-methyl-9-phenyl-8-(thiophene-2-carbonyl)-furo[2,3-h]chromen-2-one (8g, IC50 = 70 nM) showed 64-fold enhanced activity compared to the high throughput screening (HTS) hit 6a. Also, 8g was found effective in case of influenza A (H3N2) and influenza B virus strains similar to approved anti-influenza drug zanamivir (4). Preliminary mechanistic studies suggest that these compounds act as anti-influenza agents by inhibiting ribonucleoprotein (RNP) complex associated activity and have the potential to be developed further, Which Could form the basis for developing additional defense against influenza pandemics.
MAHESH V. K.; SHARMA R.; MAHESHWARI M., INDIAN J. CHEM., 1979, B17, NO 5, 528-530