Rhodium-Catalyzed Cascade Annulative Coupling of 3,5-Diarylisoxazoles with Alkynes
作者:Teppei Noguchi、Yuji Nishii、Masahiro Miura
DOI:10.1055/s-0037-1610376
日期:2019.1
the sequential construction of isoquinoline and naphtho[1,8-bc]pyran frameworks connected by a biaryl linkage is achieved by a single operation. Most of the obtained polycyclic compounds exhibit visible fluorescence in both the solution and the solid state. The hexaphenylated isoquinoline-naphthopyran conjugate (R = Ph) as a representative product shows a green emission which can be turned off by making
作为《五十周年综合报告》的一部分发行-黄金周年纪念日 抽象的 在Cu(II)氧化剂存在下,铑催化的3,5-二芳基异恶唑与三当量炔烃的级联环氧化反应平稳进行,其中异喹啉和萘并[1,8- bc ]吡喃骨架的顺序结构相连联芳键的单键操作是通过一次操作即可实现的。大部分获得的多环化合物在溶液和固态下均显示可见的荧光。作为代表产物的六苯基化异喹啉-萘并吡喃共轭物(R = Ph)显示绿色发射,可通过用酸制备异喹啉鎓盐来关闭该发射。通过用碱处理也可逆地开启发射。 在Cu(II)氧化剂存在下,铑催化的3,5-二芳基异恶唑与三当量炔烃的级联环氧化反应平稳进行,其中异喹啉和萘并[1,8- bc ]吡喃骨架的顺序结构相连联芳键的单键操作是通过一次操作即可实现的。大部分获得的多环化合物在溶液和固态下均显示可见的荧光。作为代表产物的六苯基化异喹啉-萘并吡喃共轭物(R = Ph)显示绿色发射,可通过用酸制备异喹啉鎓盐
HEPATITIS B ANTIVIRAL AGENTS
申请人:ENANTA PHARMACEUTICALS, INC.
公开号:US20160289212A1
公开(公告)日:2016-10-06
The present invention discloses compounds of Formula (I), or pharmaceutically acceptable salts, esters, or prodrugs thereof:
X-A-Y-Z-L-R
1
(I)
which inhibit the protein(s) encoded by hepatitis B virus (HBV) or interfere with the function of the HBV life cycle of the hepatitis B virus and are also useful as antiviral agents. The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from HBV infection. The invention also relates to methods of treating an HBV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention.
Cycloisomerization of acetylenic oximes and hydrazones under gold catalysis: Synthesis and cytotoxic evaluation of isoxazoles and pyrazoles
作者:J C JEYAVEERAN、CHANDRASEKAR PRAVEEN、Y ARUN、A A M PRINCE、P T PERUMAL
DOI:10.1007/s12039-015-0993-9
日期:2016.1
The synthesis of substituted isoxazoles and pyrazoles through a general cycloisomerization methodology has been reported. The capability of gold(III) chloride to promote cycloisomerization of both α, β-acetylenic oximes and α, β-acetylenic hydrazones is the centrepiece of the strategy. A range of acetylenic precursors were investigated to afford 28 examples of the products with good to excellent chemical yields. Selected compounds were screened for their cytotoxic potential towards COLO320 cancer cell lines. The IC50 values of the tested compounds were in the micromolar range, with the best compound, 5-(6-Methoxy-naphthalen-2-yl)-3-phenyl-isoxazole (3h) displaying an IC50 of 38.9 μM. For this compound, the crystal structure in complex with Aurora-A kinase was obtained which revealed details of its binding mode within the active site with a free energy of binding -9.54 kcal/mol.
Gold(III)-Catalyzed Synthesis of Isoxazoles by Cycloisomerization of α,β-Acetylenic Oximes
作者:P. Perumal、C. Praveen、A. Kalyanasundaram
DOI:10.1055/s-0029-1219342
日期:2010.3
β-acetylenic oximes leading to substituted isoxazoles was achieved using AuCl 3 as catalyst, under moderate reaction conditions. The reaction can be applied to various acetylenic oximes and gives good to excellent yields. The methodology is amenable for the selective synthesis of 3-substituted, 5-substituted or 3,5-disubstituted isoxazoles by simply altering the substituents on the acetylenic oximes.
Preparation of 3,5-Disubstituted Pyrazoles and Isoxazoles from Terminal Alkynes, Aldehydes, Hydrazines, and Hydroxylamine
作者:Ryo Harigae、Katsuhiko Moriyama、Hideo Togo
DOI:10.1021/jo4027116
日期:2014.3.7
provided the corresponding 3,5-disubstituted pyrazoles or isoxazoles in good yields with high regioselectivity, through the formations of propargyl secondary alkoxides and α-alkynyl ketones. The present reactions are one-pot preparation of 3,5-disubstituted pyrazoles from terminal alkynes, aldehydes, molecular iodine, and hydrazines, and 3,5-disubstitutedisoxazolesfrom terminal alkynes, aldehydes