Chemoselective Reaction of Benzoylisothiocyanates with Hydroxyl Group of Salicylamide: a New and Convenient Entry Into 2-Aryl-4<i>H</i>-benzo[e][1,3]oxazin-4-ones
作者:Tarjeet Singh、Girija S. Singh、Ram Lakhan
DOI:10.1080/10426507.2012.755974
日期:2013.10.1
Abstract The reactions of benzoylisothiocyanates with salicylamide in pyridine-xylene solution occurs chemoselectively at the hydroxyl group of the salicylamide to afford the corresponding O-benzoyl derivatives. The latter products, on prolonged heating in pyridine-xylene solution, undergo cyclodehydration to give 2-aryl-4H-benzo[e][1,3]oxazin-4-ones in good yields. These compounds could also be synthesized
[EN] QUINAZOLINONE COMPOUNDS AS CALCILYTICS<br/>[FR] COMPOSES DE QUINAZOLINONE UTILISES COMME CALCILYTIQUES
申请人:NPS PHARMA INC
公开号:WO2004041755A2
公开(公告)日:2004-05-21
Various calcilytic compounds and pharmaceutical compositions containing these compounds are disclosed. Calcilytic compounds are compounds capable of inhibiting calcium receptor activity. Techniques which can be used to obtain calcilytic compounds and uses of calcilyitc compounds as calcium receptor antagonists are also disclosed.
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。