Copper (II) as catalyst for intramolecular cyclization and oxidation of (1,4-phenylene)bisguanidines to benzodiimidazole-diylidenes
作者:Angela Mesias-Salazar、Oleksandra S. Trofymchuk、Constantin G. Daniliuc、Antonio Antiñolo、Fernando Carrillo-Hermosilla、Fabiane M. Nachtigall、Leonardo S. Santos、René S. Rojas
DOI:10.1016/j.jcat.2019.12.002
日期:2020.2
A synthetically useful approach of catalytic intramolecular cyclization and oxidation of 2′,2′-(1,4-phenylene)bis(1,3-dialkyl)guanidines (Alkyl = isopropyl 1 or cyclohexyl 2) catalyzed by copper acetate in acetonitrile under air was studied by on line monitoring of the reaction by ESI-MS. All-important intermediates organic species were intercepted during the experiment confirming for the first time
乙酸铜在空气中乙腈催化下催化分子内环化和氧化2',2'-(1,4-亚苯基)双(1,3-二烷基)胍(烷基=异丙基1或环己基2)的合成有用方法通过ESI-MS在线监测反应来研究。在实验过程中拦截了所有重要的中间体有机物,这首次确认了逐步的(1,4-亚苯基)双胍环化和氧化机理。此外,进行的碰撞诱导解离(CID)实验也被用作结构解析工具。双金属铜中间体Cu1([C 28 H 48 Cu 2 N 6 O 10 + H] +)m记录了m / z 575的/ z 755和Cu 2 [C 22 H 36 Cu 2 N 6 O 4 + H] +。提出了可能的关键机理步骤,包括通过反应原位监测检测到的有机和无机中间体的形成。