A convenient oxidative cyclodesulfurization method toward the synthesis of benzofused nitrogen heterocycles using inexpensive and readily available potassium periodate as an oxidant was developed. Upon treating isothiocyanates with ortho-substituted anilines bearing N,N-, N,O-, and N,S-bis-nucleophiles, followed by an intramolecular cyclization of the in situ generated monothioureas, substituted 2-aminobenzazole
Iodide catalyzed synthesis of 2-aminobenzoxazoles via oxidative cyclodesulfurization of phenolic thioureas with hydrogen peroxide
作者:Vinod K. Yadav、Vishnu P. Srivastava、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2017.12.019
日期:2018.1
A convenient and efficient oxidative cyclodesulfurization of o-phenolic thioureas to 2-aminobenzoxazoles employing TBAI (tetrabutylammonium iodide)/H2O2 catalyst/reagent system is reported. The protocol utilizes and offers a number of desired features such as metal-free, base-free, simple operation, room temperature, low cost catalyst/reagent, no need for anhydrous and inert conditions. The approach
报道了使用TBAI(碘化四丁铵)/ H 2 O 2催化剂/试剂系统将邻苯酚硫脲方便且有效地氧化成2-氨基苯并恶唑的氧化环脱硫。该方案利用并提供了许多所需的功能,例如无金属,无碱,操作简单,室温,低成本的催化剂/试剂,不需要无水和惰性条件。该方法还适用于直接从邻氨基苯酚和异硫氰酸芳基酯开始的一锅合成2-氨基苯并恶唑,产率高。
An economically and environmentally sustainable synthesis of 2-aminobenzothiazoles and 2-aminobenzoxazoles promoted by water
作者:Xinying Zhang、Xuefei Jia、Jianji Wang、Xuesen Fan
DOI:10.1039/c0gc00418a
日期:——
Tandemreactions of isothiocyanates (1) with 2-aminothiophenols (2), or isothiocyanates (1) with 2-aminophenols (4), were carried out rapidly and efficiently in water. A significant rate acceleration of the reaction between 1a and 2a in water compared with commonly used volatile organic solvents was observed. Through these reactions, a variety of structurally and pharmaceutically interesting 2-aminobenzothiazoles
[EN] HEPATITIS B ANTIVIRAL AGENTS<br/>[FR] AGENTS ANTIVIRAUX DE L'HÉPATITE B
申请人:ENANTA PHARM INC
公开号:WO2017015451A1
公开(公告)日:2017-01-26
The present invention discloses compounds of Formula (I), or pharmaceutically acceptable salts, esters, or prodrugs thereof: X-A1-Y-A2-Z-L-R (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.
The present invention discloses compounds of Formula (I), or pharmaceutically acceptable salts, esters, or prodrugs thereof:
X-A
1
-Y-A
2
-Z-L-R (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.