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。
Acid/Base-Steered Cascade Cyclization: An Efficient One-Pot Access to Diverse Isobenzofuranone and Isoindolobenzoxazinone Derivatives
We herein report the acid/base-steered two distinct reaction pathways of 2-acylbenzoic acids with isatoic anhydrides. In the presence of Na2CO3, the cascade process consists of the cyclization of 2-acetylbenzoic acid and nucleophilic ring-opening reaction of isatoic anhydride to furnish isobenzofuranone derivatives with high efficiency. However, p-toluenesulfonic acid can promote the product isobenzofuranones