Directed Nickel-Catalyzed Negishi Cross Coupling of Alkyl Aziridines
作者:Daniel K. Nielsen、Chung-Yang (Dennis) Huang、Abigail G. Doyle
DOI:10.1021/ja4076716
日期:2013.9.11
Herein we report a nickel-catalyzed C-C bond-forming reaction between simple alkyl aziridines and organozinc reagents. This method represents the first catalytic cross-coupling reaction employing a nonallylic and nonbenzylic Csp(3)-N bond as an electrophile. Key to its success is the use of a new N-protecting group (cinsyl or Cn) bearing an electron-deficient olefin that directs oxidative addition
在这里,我们报告了简单的烷基氮丙啶和有机锌试剂之间的镍催化的 CC 键形成反应。这种方法代表了第一个采用非烯丙基和非苄基 Csp(3)-N 键作为亲电子试剂的催化交叉偶联反应。其成功的关键是使用带有缺电子烯烃的新 N 保护基团(cinsyl 或 Cn),该烯烃可指导氧化加成并促进还原消除。还介绍了与阐明交叉耦合机制有关的研究。
Synthesis of novel 5-alkyl/aryl/heteroaryl substituted diethyl 3,4-dihydro-2<i>H</i>-pyrrole-4,4-dicarboxylates by aziridine ring expansion of 2-[(aziridin-1-yl)-1-alkyl/aryl/heteroaryl-methylene]malonic acid diethyl esters
作者:Satish S More、T Krishna Mohan、Y Sateesh Kumar、U K Syam Kumar、Navin B Patel
DOI:10.3762/bjoc.7.95
日期:——
A novel synthetic methodology has been developed for the synthesis of diethyl 5-alkyl/aryl/heteroaryl substituted 3,4-dihydro-2H-pyrrole-4,4-dicarboxylates (also called 2-substituted pyrroline-4,5-dihydro-3,3-dicarboxylic acid diethyl esters) by iodide ion induced ring expansion of 2-[(aziridin-1-yl)-1-alkyl/aryl/heteroaryl-methylene]malonic acid diethyl esters in very good to excellent yields under
Regio- and stereoselective synthesis of thiazoline derivatives <i>via</i> the thioketene-induced ring expansion of aziridines
作者:Qiuyue Wu、Jiaxi Xu
DOI:10.1039/d1cc06535a
日期:——
Metal-free thioketene-induced ring expansion of aziridines gave 4-alkylthiazolines stereospecifically from 2-alkylaziridines through an intramolecular substitution at the less substituted ring carbon and 5-arylthiazolines stereoselectively from 2-arylaziridines via tandem ring cleavage and formation through intimate ion-pair intermediates after nucleophilic addition of aziridines to thioketenes generated