Synthesis of Substituted Helicenes by Ir-Catalyzed Annulative Coupling of Biarylcarboxylic Acid Chlorides with Alkynes
作者:Ken Kamikawa、Hiroakira Den、Akihiro Tsurusaki、Tomoya Nagata、Masahiro Miura
DOI:10.1246/bcsj.20180081
日期:2018.7.15
were synthesized in moderate to good yields by an Ir-catalyzed annulative coupling of biarylcarboxylic acid chlorides with internal alkynes, which involves facile C-H bond cleavage and decarbonylation. The double annulative coupling of 1,1’:5’,1’’-ternaphthalene-2,2’’-dicarboxylic acid dichloride with 4-octyne was also accomplished to give rise to an S-shaped double helicene. Unexpectedly, a π-extended
通过 Ir 催化的二芳基羧酸氯化物与内部炔烃的环状偶联,合成了一系列取代的 [4] 和 [5] 螺旋烯,收率中等至良好,其中涉及容易的 CH 键断裂和脱羰。1,1':5',1''-ternaphthalene-2,2''-二羧酸二氯与4-辛炔的双环偶合也得到了S形双螺旋。出乎意料的是,当 1,1':4',1''-ternaphthalene-2 时,通过环状偶联和连续的 C(芳基)-C(芳基)键形成反应构建了 π-扩展的苯并荧蒽-合并的 [5] 螺旋,2''-二羧酸二氯化物用作底物。还研究了后一种独特产品的晶体结构和光学性质。