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
Copper-Catalyzed C-N, C-O Coupling Reaction of Arylglyoxylic Acids with Isatins
作者:Rashmi Prakash、Sanjib Gogoi
DOI:10.1002/adsc.201600516
日期:2016.10.6
The copper(II)‐catalyzed decarboxylative couplingreactions of arylglyoxylic acids with isatins afford 4H‐benzo[d][1,3]oxazin‐4‐ones via decarbonylation and concurrent C–N, C–O bond formation.
芳基乙醛酸与Isatin的铜(II)催化的脱羧偶联反应通过脱羰作用和同时的C–N,C–O键形成提供4 H-苯并[ d ] [1,3]恶嗪-4-酮。
One-pot approach to 2-arylbenzoxazinone derivatives from 2-alkynylanilines using copper-mediated tandem reactions
作者:Mitsuaki Yamashita、Akira Iida
DOI:10.1016/j.tet.2014.06.056
日期:2014.9
describe a one-pot method to obtain a variety of 2-arylbenzoxazinones and N-benzoyl anthranilic acid by using a copper catalyst and molecular oxygen as oxidants. This protocol involves tandem cyclization and oxidative processes of 2-alkynylanilines to afford significant motifs in synthetic and medicinal chemistry with moderate yields. We also demonstrated that combining the Sonogashiracoupling and the
A novel and efficient method for the oxidation of 2-arylindoles to synthesize 2-arylbenzoxazinones utilizing oxone as the sole oxidant has been developed. The reaction tolerates a wide range of functional groups and allows quick and atom-economical assembly of a variety of valuable 2-arylbenzoxazinones in high yields.
Concise synthesis of cyclic carbonyl compounds from haloarenes using phenyl formate as the carbonyl source
作者:Hideyuki Konishi、Hiroki Nagase、Kei Manabe
DOI:10.1039/c4cc09413a
日期:——
Carbonylative cyclization of haloarenes bearing nucleophilic moieties under Pd catalysis has been developed as a general, user-friendly method for access to various cyclic carbonyl compounds.