Synthesis and in vitro anti-hepatitis B virus activities of some ethyl 5-hydroxy-1H-indole-3-carboxylates
作者:Chunshen Zhao、Yanfang Zhao、Huifang Chai、Ping Gong
DOI:10.1016/j.bmc.2005.11.033
日期:2006.4
ethyl 5-hydroxy-1H-indole-3-carboxylates 6A-10T were synthesized and evaluated for their anti-hepatitisBvirus (HBV) activities in 2.2.15 cells. The IC50 and selective index of inhibition on replication of HBV DNA of compounds 10(L) (1.52 microg/ml, 9.38) and 10(P) (2.00 microg/ml, 8.85) were higher than those of the other evaluated compounds including lamivudine (7.02). Compounds 7E and 10J exhibited
The four-component reaction of ethyl-3-oxo-4-(arylsulfanyl)butanoate, substituted aromatic aldehydes and ammonium acetate afforded novel ethyl 4-hydroxy-2,6-diaryl-5-(arylsulfanyl)-1,2,5,6-tetrahydro-3-pyridinecarboxylates. These tetrahydro-pyridine esters upon dehydrogenation with dichlorodicyanobenzoquinone (DDQ) afforded highly functionalized pyridines in excellent yields. These novel heterocycles were screened for their in vitro activity against Mycobacterium tuberculosis H37Rv using agar dilution method. Among the compounds screened, ethyl 2,6-di(2-bromophenyl)-4-hydroxy-5-(phenylsulfanyl)-3-pyridinecarboxylate was found to be the most active with a minimum inhibitory concentration of 1.33 μM against Mycobacterium tuberculosis and is 5.74 and 38.17 times more potent than the first line anti-tuberculosis (TB) drugs, ethambutol and pyrazinamide respectively.
An efficient route for the synthesis of novel thioether containing dihydropyrano[2,3-c]pyrazoles has been accomplished via a solvent-free, catalyst-free, one-pot, five component domino strategy. This synthetic approach offers several advantages such as an easy work-up, no need for purification techniques and a short reaction time with good atom economy and high yields of the products (81–86%).
通过无溶剂,无催化剂,一锅,五组分多米诺骨牌策略,已经成功地完成了一种新型的含有二氢吡喃并[2,3- c ]吡唑的硫醚合成方法。这种合成方法具有许多优点,例如后处理容易,无需纯化技术,反应时间短,原子经济性好,产物收率高(81-86%)。
Rh-catalyzed intramolecular aromatic C–H insertion of α-diazo β-ketoesters: synthesis of 4-carbonyl chroman derivatives
作者:Xiaolin Zhang、Mei Lei、Yi-Nan Zhang、Li-Hong Hu
DOI:10.1016/j.tet.2014.03.093
日期:2014.5
A Rh-catalyzed intramoleculararomatic C–H insertion of α-diazo β-ketoesters was developed. This protocol offers a practical strategy for the synthesis of 4-carbonyl chroman derivatives with high yield and is compatible with a wide variety of substituents. Synthetic applications of the 4-carbonyl chroman were also demonstrated.