用于正电子发射断层扫描 (PET) 的腺苷受体 (AR) 放射性示踪剂提供了关于AR 在中枢神经系统 (CNS)中的体内生物分布的知识,这对各种神经精神疾病具有治疗意义。此外,仍然缺乏能够成像不同生理和病理条件下内源性腺苷水平变化的放射性配体。在啮齿动物 PET 研究中,已知拮抗剂腺苷 A 1受体 (A 1 R) 放射性示踪剂 [ 11 C]MDPX 的结合未能被升高的内源性腺苷抑制。由于大多数已知的 AR PET 放射性示踪剂都是拮抗剂,我们建议 A 1R 激动剂放射性配体可能对测量内源性腺苷浓度的变化具有更高的灵敏度。在此,我们报告了我们在开发用于 PET 的完全激动剂腺苷 A 1放射性配体方面的最新发现。基于 3,5-二氰基吡啶模板,设计和合成了 16 种新衍生物以优化结合亲和力和功能活性,从而产生了两种具有单位数纳摩尔亲和力和良好亚型选择性的完全激动剂(化合物27和29 )(A 1
pot, three component synthesis of 2-amino-4-aryl-3,5-dicyano-6-sulfanylpyridines and the corresponding 1,4-dihydropyridines are from readily accessible starting materials is described. Simply heating of an ethanolic solution of structurally diverse aldehydes with various thiols and malononitrile in the presence of nanocrystalline magnesium oxide provides the highly substituted pyridine derivatives
Facile and Rapid Access to Poly Functionalized Pyridine Derivatives
作者:Pravin V. Shinde、Bapurao B. Shingate、Murlidhar S. Shingare
DOI:10.1002/cjoc.201190178
日期:2011.5
An efficient and greener protocol for the synthesis of poly functionalized pyridines using tetra‐n‐butyl ammonium fluoride (TBAF) in water is established. Remarkable advantages of the present synthetic strategy over the others are shorter reaction times, higher isolated yields, reuse of catalytic system, simple work‐up procedure and more especially its applicability to heteryl and aliphatic aldehydes
Boric acid catalyzed convenient synthesis of 2-amino-3,5-dicarbonitrile-6-thio-pyridines in aqueous media
作者:Pravin V. Shinde、Swapnil S. Sonar、Bapurao B. Shingate、Murlidhar S. Shingare
DOI:10.1016/j.tetlet.2009.12.146
日期:2010.3
A one-pot three-component condensation of an aldehyde, malononitrile, and thiophenol has been achieved by conventional and ultrasound method. The reaction has been catalyzed by boric acid in aqueous medium. This protocol afforded corresponding 2-amino-3,5-dicarbonitrile-6-thio-pyridines in shorter reaction times and high yields with the green aspects by avoiding toxic catalysts and solvents.
An Improved Procedure for the Three-Component Synthesis of Highly Substituted Pyridines Using Ionic Liquid
作者:Brindaban C. Ranu、Ranjan Jana、S. Sowmiah
DOI:10.1021/jo070015g
日期:2007.4.1
A basicionicliquid, [bmIm]OH, efficiently promotes a one-pot, three-component condensation of aldehydes, malononitrile, and thiophenols to produce highly substituted pyridines in high yields at room temperature. This reaction does not involve any hazardous organic solvent and toxic catalyst. The ionicliquid is recovered and recycled for subsequent reactions.
Sodium chloride: a proficient additive for the synthesis of pyridine derivatives in aqueous medium
作者:Jitendra B. Gujar、Mahendra A. Chaudhari、Deepak S. Kawade、Murlidhar S. Shingare
DOI:10.1016/j.tetlet.2014.10.125
日期:2014.12
A facile and convenient synthesis of substituted pyridinederivatives catalysed by NaCl in the presence aqueousmedia under reflux and ultrasound irradiation has been developed via a one-pot multicomponent reaction, in which four new bonds were formed. Particularly valuable features of this protocol including mild conditions, simple execution, broad substrate scope and good yields of products make