Carbonylative Synthesis of Phthalimides and Benzoxazinones by Using Phenyl Formate as a Carbon Monoxide Source
作者:Sujit P. Chavan、Bhalchandra M. Bhanage
DOI:10.1002/ejoc.201500109
日期:2015.4
efficient palladium-catalyzed carbonylative cyclization of N-substituted 2-iodobenzamides and 2-iodoanilides was investigated for the synthesis of phthalimides and benzoxazinones, respectively, by usingphenylformate as a CO source. The present catalytic protocol circumvents the use of an expensive phosphine ligand as well as solvent in the case of the phthalimidesynthesis. Moreover, mild reaction conditions
通过使用甲酸苯酯作为 CO 源,研究了一种简单有效的钯催化的 N-取代 2-碘苯甲酰胺和 2-碘苯胺的羰基化环化反应,分别用于合成邻苯二甲酰亚胺和苯并嗪酮。本催化协议在邻苯二甲酰亚胺合成的情况下避免使用昂贵的膦配体以及溶剂。此外,温和的反应条件和对各种官能团的耐受性增强了该方法的普遍适用性。
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
Synthesis of 3H-Quinazolin-4-ones and 4H-3,1-Benzoxazin-4-ones via Benzylic Oxidation and Oxidative Dehydrogenation using Potassium Iodide-tert-Butyl Hydroperoxide
作者:R. Arun Kumar、C. Uma Maheswari、Satheesh Ghantasala、C. Jyothi、K. Rajender Reddy
DOI:10.1002/adsc.201000580
日期:2011.2.11
and elegant method for benzylic activation was demonstrated employing the potassium iodide/tert-butyl hydrogen peroxide catalytic system. This methodology was further extended for the synthesis of biologically important heterocycles namely, 3H-quinazolin-4-ones and 4H-3,1-benzoxazin-4-ones including mecloqualone and etaqualone which are important quinazolinone-based drugs used for the treatment of insomnia
用碘化钾/叔丁基过氧化氢催化体系证明了一种简单而优雅的苄基活化方法。该方法被进一步扩展为合成重要的杂环化合物,即3 H-喹唑啉-4-酮和4 H -3,1-苯并恶嗪-4-酮,包括甲氯喹酮和依他马酮,这是用于治疗的基于喹唑啉酮的重要药物失眠的好收成。
Ruthenium catalyzed chemo and site-selective C–H amidation of oxobenzoxazine derivatives with sulfonyl azides
作者:Manickam Bakthadoss、Polu Vijay Kumar、Ravan Kumar、Manickam Surendar、Duddu S. Sharada
DOI:10.1039/c9nj02452b
日期:——
A novel and general protocol towards the synthesis of highly functionalized ortho-amido oxobenzoxazine frameworks via ruthenium catalyzed intermolecular C–H amidation using sulfonyl azides as amidation components has been developed for the first time.