Synthesis of Some 2-Aryl-1,2,4-triazolo[1,5-c][1,3]benzoxazin-5-ones as Tools To Define the Essential Pharmacophoric Descriptors of a Benzodiazepine Receptor Ligand
The synthesis and benzodiazepine receptor (BZR) affinity of some 1,2,4-triazolo[1,5-c][1,3]benzoxazin-5-ones, 2-22, are reported. Compounds 2-22 are devoid of the proton donor group, which according to a BZR schematic model was one of the pharmacophoric descriptors for receptor-ligand interaction. The binding data show that 2-(2-fluorophenyl)-9-chloro-1,2,4-triazolo[1,5-c][1,3]benzoxazin-5-one (12) and some other compounds display nanomolar BZR affinity, indicating that the hydrogen donor group is not essential for the anchoring of 6,6,5-tricyclic systems to the BZR but only affects the potency of a ligand.
Titherley; Hughes, Journal of the Chemical Society, 1910, vol. 97, p. 1378
作者:Titherley、Hughes
DOI:——
日期:——
Hughes; Titherley, Journal of the Chemical Society, 1912, vol. 101, p. 221
作者:Hughes、Titherley
DOI:——
日期:——
Synthesis of 2‐(2‐Hydroxyaryl)‐4
<i>H</i>
‐benzo[
<i>e</i>
][1,3]oxazin‐4‐ones by Palladium‐Catalyzed C(
<i>sp</i>
<sup>2</sup>
)−H Hydroxylation via Electro‐chemical Oxidation
More importantly, use anodic oxidation to avoid the use of potentially toxic and polluting oxidants. A gram‐scale direct electrochemical hydroxylation of 2‐phenyl‐4H ‐benzo[e ][1,3]oxazin‐4‐one was performed, and the hydroxylation product was applied to synthesize the drug deferasirox. In addition, the single crystal of 2‐(2‐hydroxyphenyl)‐4H ‐benzo[e ][1,3]oxazin‐4‐one was obtained and determined by
以Pd(OAc)2为催化剂,恶嗪环为导向基团和Oxone为羟基化作用开发了2-芳基-4 H-苯并[ e ] [1,3]恶嗪-4-酮的电化学直接邻羟基化反应试剂。在温和条件下获得了一系列羟基化产物,收率从中等到良好。该方法的特征在于良好的官能团耐受性和广泛的底物。更重要的是,使用阳极氧化以避免使用潜在的有毒和污染性氧化剂。的2-苯基-4-甲克级直接电化学羟化ħ苯并[ ë进行] [1,3]恶嗪-4-酮的合成,并应用羟基化产物合成地拉罗司。另外,获得了2-(2-羟基苯基)-4- H-苯并[ e ] [1,3]恶嗪-4-酮的单晶并通过X射线衍射测定。最后,提出了反应机理并通过循环伏安法(CV)进行了验证。该协议还提供了分子功能化的另一种电化学羟基化方法。