作者:Derong Cao、Chunmei Gao、Herbert Meier
DOI:10.1055/s-2005-921929
日期:——
condensation, electrophilic substitu-tion, transannular ring closure Triptycene and its derivatives have attracted great atten-tion because of (1) their rigid aromatic three-dimensionalstructure and conformational properties, 1 (2) unique elec-trochemical and photochemical properties, 2 (3) potentialpharmaceutical properties, 3 and (4) applications in mate-rials science and supramolecular chemistry. 4 However
摘要:取代的反式-10-苄基-9-蒽醇5a、b和取代的10,10-二苄基-9-蒽醇8e在甲酸或草酸存在下发生分子内环化,得到高三萜9a、b、e。根据所用酸的量,观察到 5a、b 与蒽衍生物 10a、b 的竞争性 1,4-脱水。后一个过程是蒽酚的唯一反应途径,它们在苄基部分( 5c , d → 10c , d )上不具有给电子取代基。关键词:芳构化、缩合、亲电取代、跨环闭合 三萜及其衍生物由于(1)其刚性的芳香三维结构和构象特性,1(2)独特的电化学和光化学而备受关注特性,2 (3) 潜在的药物特性,3和(4)在材料科学和超分子化学中的应用。4 然而,合成同型三萜烯的例子只有少数报道。克里斯托