Synthesis of Diverse Nitrogen Heterocycles <i>via</i>
Palladium-Catalyzed Tandem Azide-Isocyanide Cross-Coupling/Cyclization: Mechanistic Insight using Experimental and Theoretical Studies
作者:Arshad J. Ansari、Ramdas S. Pathare、Antim K. Maurya、Vijai K. Agnihotri、Shahnawaz Khan、Tapta Kanchan Roy、Devesh M. Sawant、Ram T. Pardasani
DOI:10.1002/adsc.201700928
日期:2018.1.17
A rapid and elegant tandem azide–isocyanide cross‐coupling/cyclization protocol has been developed based on a nitrene transfer reaction. The palladium‐catalyzed ligand‐free methodology led to the synthesis of three different heterocyclic scaffolds with excellent atom/step/redox economy. Studies based on first‐principles‐based quantum calculations and control experiments unraveled a concerted process
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.
A Cu<sub>2</sub>O/TBAB-promoted approach to synthesize heteroaromatic 2-amines <i>via</i> one-pot cyclization of aryl isothiocyanates with <i>ortho</i>-substituted amines in water
An efficient approach to synthesize heteroaromatic 2-amines from one-pot desulfurization/dehydrogenative cyclization of aryl isothiocyanates with ortho-substituted amines in water was developed. This approach tolerated a wide range of functional groups on the aromatic ring, providing a practical and environment-friendly process to synthesize heteroaromatic 2-amines in moderate to excellent yields.
开发了一种在水中用邻位取代胺一锅法脱硫/脱氢环化芳基异硫氰酸酯合成杂芳族 2-胺的有效方法。这种方法在芳环上具有多种官能团,提供了一种实用且环境友好的方法,可以以中等至优异的产率合成杂芳族 2-胺。提出了一种似是而非的机制,并借助 ESI 质谱法提出了 TBAB 和 Cu 2 O 在本策略中的作用。
Electrochemical NaI/NaCl-mediated one-pot synthesis of 2-aminobenzoxazoles in aqueous media<i>via</i>tandem addition–cyclization
An electrochemical synthesis of 2-aminobenzoxazoles from 2-aminophenols and isothiocyanates was successfully developed in a one-pot fashion. Using inexpensive and widely available NaI and NaCl co-operatively in catalytic amounts, our electrosynthesis approach provided various 2-aminobenzoxazole products in moderate to high yields in an open-flask type undivided cell without using any external supporting
以一锅法成功开发了由 2-氨基苯酚和异硫氰酸酯电化学合成 2-氨基苯并恶唑。我们的电合成方法以催化量合作使用廉价且广泛可用的 NaI 和 NaCl,在不使用任何外部支持电解质和碱的情况下,在开放式烧瓶型未分隔电池中以中等至高产率提供各种 2-氨基苯并恶唑产品。该协议可用于以中等产率从相应的 2-苯硫酚合成 2-氨基苯并噻唑。该协议有很多好处。它不含金属且具有高度可扩展性,并在温和条件下使用廉价的介质和乙醇/水作为环保溶剂。
Environment-friendly and efficient synthesis of 2-aminobenzo-xazoles and 2-aminobenzothiazoles catalyzed by <i>Vitreoscilla</i> hemoglobin incorporating a cobalt porphyrin cofactor
作者:Yaning Xu、Fengxi Li、Nan Zhao、Jiali Su、Chunyu Wang、Ciduo Wang、Zhengqiang Li、Lei Wang
DOI:10.1039/d1gc02533c
日期:——
In this study, an environment-friendly and efficient artificial Vitreoscilla hemoglobin (VHb) for the synthesis of 2-aminobenzoxazoles and 2-aminobenzothiazoles has been reported. We demonstrate an expression-based porphyrinsubstitution strategy to produce VHb containing cobalt porphyrin instead of native hemin, which can catalyze the oxidative cyclization of corresponding 2-aminobenzoxazoles and