光可切换化合物可以通过光在两种异构体之间可逆地切换,继续引起广泛应用的显着关注。偶氮杂芳烃代表了一种相对较新但研究不足的光开关类型,其中传统偶氮苯类中的一个芳环已被五元杂芳环取代。初步研究表明,偶氮杂芳烃——特别是芳基并吡唑——具有优异的光开关特性(定量开关和长 Z 异构体半衰期)。在这里,我们提出了一项系统的计算和实验研究,以阐明芳基并吡唑的长热半衰期和优异的可寻址性的起源,并应用这一理解来确定各种可比较的偶氮杂芳基光开关的重要结构-性质关系。我们通过杂环的调节,鉴定了具有 Z 异构体半衰期从几秒到几小时、到几天甚至几年以及可变吸收特性的化合物。构象可能在决定这些性质方面发挥着最大的作用:异构化半衰期最长的化合物采用 T 形基态 Z 异构体构象并通过 T 形异构化途径进行,而对于具有最长异构化半衰期的化合物,实现了最完整的光开关具有扭曲(而不是 T 形)的 Z 异构体构象。通过平衡这些因素,我们报告了一种新的偶氮吡唑
Isoquinoline compounds and their use as inhibitors of HPK1 (hematopoietic kinase 1) are described. The compounds are useful in treating HPK1-dependent disorders and enhancing an immune response. Also described are methods of inhibitng HPK1, methods of treating HPK1-dependent disorders, methods for enhancing an immune response, and methods for preparing the isoquinoline compounds.
Silica–Sulfuric Acid Catalyzed Nitrodeiodination of Iodopyrazoles
作者:P. Ravi、Girish M. Gore、Arun K. Sikder、Surya P. Tewari
DOI:10.1080/00397911.2011.584261
日期:2012.12.1
We report here the synthesis of nitropyrazoles in good to excellent yields from iodopyrazoles over silica-sulfuric acid catalyst for the first time. The present procedure require less acid, offers a simplified workup procedure, and may be applied for the nitration of a wide variety of iodoazoles in drug and pharmaceutical industries.
Faujasite catalyzed nitrodeiodination of iodopyrazoles
作者:P. Ravi、Surya P. Tewari
DOI:10.1016/j.catcom.2013.07.032
日期:2013.12
Nitrodeiodination of iodopyrazoles using nitric acid/Faujasite has been investigated. The present procedure is simple, rapid and convenient and requires no sulfuric acid or oleum and may be applied for the synthesis of several nitropyrazoles in good yields in drug and pharmaceutical industries. (C) 2013 Elsevier B.V. All rights reserved.
Facile and environmentally friendly synthesis of nitropyrazoles using montmorillonite K-10 impregnated with bismuth nitrate
作者:P. Ravi、Surya P. Tewari
DOI:10.1016/j.catcom.2011.12.016
日期:2012.3
Nitropyrazoles in higher yields were synthesized using montmorillonite K-10 impregnated with bismuth nitrate and the present procedure may be applied for the nitration of a wide variety of azoles in the drug and pharmaceutical industries. (C) 2011 Elsevier B.V. All rights reserved.