Catalyst-free one-pot cascade cyclization: An efficient synthesis of isoindolobenzoxazinones and isoindoloquinazolinones derivatives
作者:Wenzhong Li、Baibai Wan、Ran Shi、Si Chen、Jiazhu Li、Fangzhen Wang、Hexu Niu、Xin-Ming Xu、Wei-Li Wang
DOI:10.1016/j.tet.2021.132571
日期:2022.1
A practical and efficient catalyst-free cascade cyclization reaction of 2-acylbenzoic acids with various amino alcohols or diamines was developed. This protocol provides a powerful and straightforward method for the one-pot synthesis of diverse isoindolobenzoxazinones, isoindoloquinazolinones and their derivatives. The synthetic strategy evades the use of catalyst, shows a broad substrate scope and
Diverse privileged <i>N</i>-polycyclic skeletons accessed from a metal-free cascade cyclization reaction
作者:Wenzhong Li、Yu Wang、Huijing Qi、Ran Shi、Jiazhu Li、Si Chen、Xin-Ming Xu、Wei-Li Wang
DOI:10.1039/d1ob01206a
日期:——
An exquisite metal-free cascade cyclizationreaction of 2-acylbenzoic acids with amines was developed, which provided a powerful method for the one-potsynthesis of diverse isoindoloisoquinoline and benzoindolizinoindole derivatives. This protocol avoided the use of metal catalysts, proceeded with high efficiency and had broad substrate scope. These resulting products could be transformed into tertiary
Intramolecular Arylation of Tertiary Enamides through Pd(OAc)<sub>2</sub>-Catalyzed Dehydrogenative Cross-Coupling Reaction: Construction of Fused <i>N</i>-Heterocyclic Scaffolds and Synthesis of Isoindolobenzazepine Alkaloids
作者:Wenju Zhu、Shuo Tong、Jieping Zhu、Mei-Xiang Wang
DOI:10.1021/acs.joc.9b00010
日期:2019.3.1
Pd(OAc)2-catalyzed intramolecular dehydrogenative cross-coupling reaction between tertiaryenamides, which were derived from the condensation of 2-arylethylamines and methyl o-acetylbenzoate, and arenes enabled synthesis of 7,8-dihydro-5H-benzo[4,5]azepino[2,1-a]isoindol-5-one derivatives under mild conditions. The synthetic method was applied in the total synthesis of aporhoeadane alkaloids palmanine
Pd(OAc)2催化叔烯酰胺之间的分子内脱氢交叉偶联反应,后者是由2-芳基乙胺与邻乙酰基苯甲酸甲酯的缩合反应生成的,而芳烃则可以合成7,8-二氢-5 H-苯并[4] ,5] azepino [2,1 - a ] isoindol-5-one衍生物在温和的条件下。该合成方法仅需三到四个步骤即可用于阿魏酸钠,生物碱棕榈碱,伦诺沙明和邻苯二胺的全合成。
Synthesis of 1,2-dihydro-2-oxo-4-quinolinyl phosphates from 2-acyl-benzoic acids
作者:Xinhua He、Tharcilla Aglio、Jeffrey R. Deschamps、Rachita Rai、Fengtian Xue
DOI:10.1016/j.tetlet.2015.01.188
日期:2015.3
2-acyl-benzoic acids (2a-l) in the presence of phosphoryl azides via a one-pot cascade reaction involving a Curtiusrearrangement, an intramolecular nucleophilic addition of the enol carbon to the isocyanate intermediate, and an addition-elimination of the enol oxygen to the phosphoryl azide. During the reaction three new bonds are formed under mild conditions to yield 1,2-dihydro-2-oxo-4-quinolinyl phosphates
An efficient asymmetricsynthesis of isochromanone derivatives was realized through Z-selective-1,3-OH insertion/aldol cyclization reaction involving acyclic carboxylic oxonium ylides. The combination of achiral dirhodium salts and chiral N,N′-dioxide–metal complexes, along with the use of α-diazoketones instead of α-diazoesters, enables the cascade reaction efficiently. A variety of benzo-fused δ-lactones