Synthesis and properties of bis(heteroazulen-3-yl)methyl cations and bis(heteroazulen-3-yl)ketones
作者:Shin-ichi Naya、Makoto Nitta
DOI:10.1016/s0040-4020(03)00546-5
日期:2003.6
The synthesis and properties of a novel type of bis(heteroazulen-3-yl)methyl cations, bis(2-oxo-2H-cyclohepta[b]furan-3-yl)methyl cation salt and nitrogen analogues, (9a–c·PF6−) and (9a–c·BF4−), as well as bis(heteroazulen-3-yl)ketones (12a–d) are studied. The synthetic method was based on a TFA-catalyzed electrophilic aromatic substitution on the heteroazulenes (6a–d) with paraformaldehyde to afford
新型双(杂氮杂烯基-3-基)甲基阳离子,双(2-氧代-2 H-环庚[ b ]呋喃-3-基)甲基阳离子盐和氮类似物的合成与性质,(9a – c ·PF 6 - )和(9A - ç ·BF 4 - ),以及双(heteroazulen -3-基)酮(12A - d)进行了研究。合成方法是基于TFA催化的杂多烯(6a - d)上的多聚甲醛亲电取代,得到相应的二取代甲烷衍生物7a - d,然后用DDQ氧化氢抽象,然后使用aq。交换抗衡阴离子。HPF 6或水溶液 HBF 4。此外,7a - d与2.2当量的反应。一定数量的DDQ得到羰基化合物12a - d。通过1 H和13 C NMR光谱数据评估9a – c正电荷的离域。阳离子9a – c的热力学稳定性经评估为9a < 9b < 9c根据通过循环伏安法(CV)测量的还原电位和分光光度法获得的p K R +值(2.6–10.3)。阳离子9a – c的