Concise Synthesis of [1,1′-Biisoquinoline]-4,4′-diol<i>via</i>a Protecting Group Strategy and Its Application for Potential Liquid-Crystalline Compounds
作者:Elisabeth Kapatsina、Markus Mateescu、Angelika Baro、Wolfgang Frey、Sabine Laschat
DOI:10.1002/hlca.200900085
日期:2009.10
Williamson etherification (Scheme 4). Slightly modified conditions were applied to the esterification of 4a⋅2 HCl with galloyl chlorides 10a–h as well as etherification of 4a⋅2 HCl with 6‐bromohexyl tris(alkyloxy)benzoates 11b,d–h and [(6‐bromohexyl)oxy]‐substituted pentakis(alkyloxy)triphenylenes 14a–c (Scheme 5). Despite the bulky substituents, the respective target 1,1′‐biisoquinolines 12, 13, and 15
的[1,1'- biisoquinoline] -4,4'-二醇(4A),其为盐酸盐4A从甲氧基甲基开始两个步骤⋅2盐酸(MOM)保护的1-氯异喹啉8(方案3),打开了进一步获得O-官能化的二异喹啉衍生物的途径。化合物4A ⋅2的HCl与4-(十六烷氧基)苯甲酰氯(酯化图5b),得到相应的二酯3B(方案4),这可能不是由Ni基自偶联介导而得到图6b(方案2)。通过4a的反应,醚衍生物2b可以良好的收率获得。在Williamson醚化条件下,用相应的烷基溴9组成的⋅2HCl (方案4)。略作修改的条件被应用到的酯化4A ⋅2HCl中没食子酰氯化物10A - ħ以及醚化4A ⋅2的HCl与6-溴己基三(烷氧基)苯甲酸11b中,d - ħ和[(6-溴己基)氧基]-取代的五(烷氧基)三亚苯基14a – c(方案5)。尽管有大量取代基,但各自的目标1,1'-双异喹啉12、13和分离出15种,收率为14-86%(表)。