Synthesis of Diels–Alder adducts of N-arylmaleimides by a multicomponent reaction between maleic anhydride, dienes, and anilines
作者:J. Alberto Guevara-Salazar、Delia Quintana-Zavala、Hugo A. Jiménez-Vázquez、José Trujillo-Ferrara
DOI:10.1007/s00706-011-0515-5
日期:2011.8
AbstractWe have carried out the synthesis and characterization of some hexahydroisoindolyl benzoic acids and their corresponding ethyl esters by a multicomponent reaction (MCR) between aminobenzoic acids or aminobenzoates, maleicanhydride, and isoprene in the absence of catalysts. According to additional experiments, the MCR takes place by sequential formation of N-arylmaleamic acids from the aminobenzoic
摘要我们在不存在催化剂的情况下,通过氨基苯甲酸或氨基苯甲酸酯,马来酸酐和异戊二烯之间的多组分反应(MCR),对一些六氢异吲哚基苯甲酸及其相应的乙酯进行了合成和表征。根据其他实验,MCR是通过依次从氨基苯甲酸或氨基苯甲酸酯和顺丁烯二酸酐,酸和异戊二烯的Diels–Alder加合物,最后是酰亚胺形成N-芳基马来酰胺酸而发生的。加合物的1 H NMR数据(耦合常数)表明,相应的环己烯环的优选构型是顺式-船,由密度泛函理论(DFT)构象分析和相应构象异构体自旋-自旋耦合常数的DFT计算所支持的事实。我们的MCR合成方法在其他加合物的合成中成功进行了测试,其中使用了环戊二烯和其他苯胺。 图形概要
Enantioselective Nickel-Catalyzed Hydrocyanative Desymmetrization of Norbornene Derivatives
nickel-catalyzed enantioselective hydrocyanation of N-aryl 5-norbornene-endocis-2,3-dicarboximides was reported. This desymmetrization process allows for a quick construction of both continuous stereogenic carbon centers and remote N–CAr atropisomeric chirality. Mechanism studies indicated that the resident carbonyl group of the substrates plays a key role in the enantioselectivity.
Catalytic Diastereospecific and Enantioselective (3 + 2) Transannulations of 1,2,3-Thiadiazoles with Strained Norbornene Derivatives
作者:Cunzhi Chen、Shuyan Fang、Ziyang Dong、Jiaxi Xu、Zhanhui Yang
DOI:10.1021/acs.orglett.2c00330
日期:2022.3.25
ring-strain-release strategy, iridium-catalyzed transannulations with norbornene derivatives are achieved in a diastereospecific and enantioselective manner. The first asymmetric transannulations of 1,2,3-thiadiazoles are reported.