Room Temperature Copper(II)-Catalyzed Oxidative Cyclization of Enamides to 2,5-Disubstituted Oxazoles via Vinylic C–H Functionalization
摘要:
A copper(11)-catalyzed oxidative cyclization of enamides to oxazoles via vinylic C-H bond functionalization at room temperature is described. Various 2,5-disubstituted oxazoles bearing aryl, vinyl, alkyl, and heteroaryl substituents could be synthesized in moderate to high yields. This reaction protocol is complementary to our previously reported iodine-mediated cyclization of enamides to afford 2,4,5-trisubstituted oxazoles.
BETA-PHOSPHONYL-ENAMINE DERIVATIVE AND PREPARATION METHOD THEREFOR
申请人:SOOCHOW UNIVERSITY
公开号:US20210130377A1
公开(公告)日:2021-05-06
The present invention discloses the preparation method of β-phosphonyl-enamine derivative. The preparation method comprising the following steps: dissolving the enamine derivative, organic phosphine compound, manganese acetate and potassium carbonate in the solvent, reacting at room temperature to obtain the β-phosphonyl-enamine derivative. The enamine derivative was as the starting material, and the raw materials are easy to obtain and a great many varieties. The various forms of the products obtained therein can be directly applied and can be used in further reactions. The reaction conditions are mild, the reaction speed is high, the reaction operation and the post-treatment process are simple, the production is convenient, and the method is suitable for large-scale production.
BETA-AMINO PHOSPHONIC ACID DERIVATIVE AND PREPARATION METHOD THEREFOR
申请人:SOOCHOW UNIVERSITY
公开号:US20210130376A1
公开(公告)日:2021-05-06
A method for preparing a β-amino phosphonic acid derivative includes: dissolving N-(arylvinyl)benzamide, dialkyl phosphite, manganese acetate, and potassium carbonate in a solvent and reacting at room temperature to obtain (2-benzamido-1-arylvinyl)dialkyl-phosphonate derivative; and hydrolyzing (2-benzamido-1-arylethyl) dialkylphosphonate derivative to obtain β-amino phosphonic acid derivative. The N-(arylvinyl) benzamide derivative is used as starting material. The raw materials are easy to obtain and are of many different types. A method of preparing β-aminophosphonic acid derivative includes: dissolving N-(arylvinyl)benzamide, dialkyl phosphite, manganese acetate and potassium carbonate in a solvent, reacting at room temperature to obtain (2-benzamide-1-arylvinyl) dialkyl phosphonate derivative, and then reducing and hydrolyzing the compound to obtain β-aminophosphonic acid derivative. The method of the invention has the advantages of short synthesis route, mild reaction conditions, simple reaction operation and post-treatment process, good yield, and is suitable for large-scale production.
Room Temperature Copper(II)-Catalyzed Oxidative Cyclization of Enamides to 2,5-Disubstituted Oxazoles via Vinylic C–H Functionalization
作者:Chi Wai Cheung、Stephen L. Buchwald
DOI:10.1021/jo301332s
日期:2012.9.7
A copper(11)-catalyzed oxidative cyclization of enamides to oxazoles via vinylic C-H bond functionalization at room temperature is described. Various 2,5-disubstituted oxazoles bearing aryl, vinyl, alkyl, and heteroaryl substituents could be synthesized in moderate to high yields. This reaction protocol is complementary to our previously reported iodine-mediated cyclization of enamides to afford 2,4,5-trisubstituted oxazoles.
Herein, a selective and efficient CO2-mediated Z to E isomerization of enamides is reported. Notably, CO2 acts as a promoter to form the key reaction intermediate. This protocol provides a novel method for the selective isomerization of enamides under mild conditions with moderate to excellent yields. The method exhibits a broad substrate scope, including late-stage modification of biorelevant molecules
在此,报道了烯酰胺的选择性且有效的CO 2介导的Z至E异构化。值得注意的是,CO 2充当形成关键反应中间体的促进剂。该方案提供了一种在温和条件下选择性异构化烯酰胺的新方法,具有中等至优异的产率。该方法具有广泛的底物范围,包括生物相关分子的后期修饰。通过循环伏安法 (CV) 和密度泛函理论 (DFT) 计算得出的机理见解提供了证据,证明中间体通过非常规的 C 中心模式促进了反应。