已开发出一种Pd催化的新颖有效的方案,可将2-苯基-4- H-苯并[ d ] [1,3]恶嗪-4-酮与α-氧代羧酸直接官能化,生成5 H-苯并[ 4,5] [1,3]恶嗪基[2,3 - a ]异吲哚-5,11 (6a H)-二酮使用(NH 4)2 S 2 O 8作为有效氧化剂,AgNO 3作为共氧化剂。发现所有探索的底物均适用于该转化,并以中等至优异的产率递送了相应的所需产物。
Radical-Induced, Palladium-Catalyzed C-H Activation: An Approach to Functionalize 4<i>H</i>
-Benzo[<i>d</i>
][1,3]oxazin-4-one Derivatives by Using Toluenes, Aldehydes, and Benzyl Alcohols
作者:Prashant Kumar、Mohit Gupta、Vijay Bahadur、Virinder S. Parmar、Brajendra K. Singh
DOI:10.1002/ejoc.201800263
日期:2018.4.9
Toluenes, aldehydes, and benzylalcohols have been utilized in the radical‐induced direct functionalization of 4H‐benzo[d][1,3]oxazin‐4‐one derivatives by using a palladium‐catalyzed C–Hactivation strategy. Mechanistic investigations illustrate the radical pathway and highlight the importance of both catalyst and oxidant.
甲苯,醛和苯甲醇已通过钯催化的C–H活化策略用于自由基诱导的4 H-苯并[ d ] [1,3]恶嗪-4-酮衍生物的直接官能化。机理研究说明了自由基途径,并突出了催化剂和氧化剂的重要性。
作者:Biju Majhi、Debasish Kundu、Tubai Ghosh、Brindaban C. Ranu
DOI:10.1002/adsc.201500786
日期:2016.1.21
much interest as they are found in a large array of natural products and pharmaceutical drugs with diverse activities. We have developed a palladium‐catalyzed decarboxylative selective mono‐ and bis‐acylation of 4H‐benzo[d][1,3]oxazin‐4‐one derivatives with α‐oxo carboxylic acids via preferential cyclic imine‐N‐directed CH activation. 2‐Aryl‐4H‐benzo[d][1,3]oxazin‐4‐one was acylated with a variety
苯并恶嗪支架引起了人们的极大兴趣,因为它们存在于多种具有多种活性的天然产物和药物中。我们已经开发了钯-催化的脱羧的选择性单-和4之二酰化ħ -苯并[ d ] [1,3]恶嗪-4-酮衍生物与α氧代羧酸经由优惠环状亚胺Ñ -directedÇ H激活。2-芳基-4 H-苯并[ d ] [1,3]恶嗪-4-酮被各种取代的苯乙醛酸酰化,生成相应的产物。观察到给电子基团(CH 3,OCH 3)苯乙醛酸芳香环的任何位置均可提供良好的优异收率,而含有吸电子基团(COCH 3,CN,NO 2)的苯乙醛酸则可提供中等收率的产物。有趣的是,当在4当量乙醛酸存在下用三氟甲磺酸银(AgOTf)代替硝酸银(AgNO 3)进行反应时,会得到双酰化产物和少量单酰化产物。这是2-芳基-4-酰化的第一报告ħ -苯并[ d ] [1,3]恶嗪-4-酮通过Ç H激活。该反应的显着特征是与更具挑战性的杂芳烃-氧代羧酸和烷基
Palladium‐Catalyzed Decarboxylative Synthesis of 5
<i>H</i>
‐Benzo[4,5][1,3]oxazino[2,3‐
<i>a</i>
]isoindole‐5,11(6a
<i>H</i>
)‐Diones using 2‐Phenyl‐4
<i>H</i>
‐Benzo[
<i>d</i>
][1,3]oxazin‐4‐Ones and α‐Oxo Carboxylic Acids
作者:Ram Sunil Kumar Lalji、Prashant Kumar、Mohit Gupta、Virinder S. Parmar、Brajendra K. Singh
DOI:10.1002/adsc.201901142
日期:2020.2.6
A Pd‐catalyzed novel and efficient protocol has been developed for the direct functionalization of 2‐phenyl‐4H‐benzo[d][1,3]oxazin‐4‐ones with α‐oxocarboxylicacids resulting in 5H‐benzo[4,5][1,3]oxazino[2,3‐a]isoindole‐5,11(6aH)‐dionesusing (NH4)2S2O8 as effective oxidant and AgNO3 as co‐oxidant. All the explored substrates were found to be compatible for this transformation and delivered the corresponding
已开发出一种Pd催化的新颖有效的方案,可将2-苯基-4- H-苯并[ d ] [1,3]恶嗪-4-酮与α-氧代羧酸直接官能化,生成5 H-苯并[ 4,5] [1,3]恶嗪基[2,3 - a ]异吲哚-5,11 (6a H)-二酮使用(NH 4)2 S 2 O 8作为有效氧化剂,AgNO 3作为共氧化剂。发现所有探索的底物均适用于该转化,并以中等至优异的产率递送了相应的所需产物。