Modular Approach to the Synthesis of Two-Dimensional Angular Fused Acenes
作者:Mikhail Feofanov、Vladimir Akhmetov、Dmitry I. Sharapa、Konstantin Amsharov
DOI:10.1021/acs.orglett.9b04382
日期:2020.3.6
Herein, we present a modular approach to pristine angularly fused planar acenes. The approach includes the Pd-catalyzed fusion of several building blocks and implements a dehydrative π-extension (DPEX) reaction as a key step enabling facile access to diverse two-dimensional acenes. The scope was demonstrated on nine examples with up to quantitative yield.
characterised. Regarding the structure, the compounds are π-conjugated (cross and linear, respectively) and feature thiophene terminated side arms attached to five different positions of the anthraquinone or anthracene core. The synthesis of the compounds involves a cross-coupling procedure in the key reaction steps. Crystalstructures of compounds 5 and 19 have been studied. The thiophene containing title compounds
Stericallycrowdedtriarylphosphinesbearing anthraquinones were synthesized by Suzuki–Miyaura coupling of arylboronic acids derived from (bromoaryl)phosphines with haloanthraquinones. The anthraquinone bearing the two triarylphosphine moieties at the 2,6-positions shows the smaller difference between the oxidation potential of the triarylphosphine moieties and the reduction potential of the anthraquinone
通过使(溴芳基)膦衍生的芳基硼酸与卤代蒽醌的Suzuki-Miyaura偶联,合成了带有蒽醌的立体拥挤的三芳基膦。在2,6-位带有两个三芳基膦部分的蒽醌显示出三芳基膦基部分的氧化电势与蒽醌部分的还原电势之间的差异较小,而可见红移越多,导致红褐色表示为:与1,5-衍生物相比。通过使用(溴芳基)膦和氯萘醌衍生物衍生的芳基硼酸,通过重复的Suzuki-Miyaura偶联反应,也合成了由三个三芳基膦和四个萘醌部分交替排列组成的空间拥挤的三芳基膦-萘醌低聚物。这低聚物的31 P NMR光谱由窄范围内的几个峰组成,反映了非对映异构体的分布,该非对映异构体的分布是由磷原子上由三个芳环组成的螺旋桨的螺旋线引起的。低聚物呈现出紫色,这是由于分子内电荷从三芳基膦部分转移到相邻的萘醌部分而引起的,并且电荷转移带的波长和强度与氧化还原电位和相邻的三芳基膦–萘醌的数目具有明显的相关性。对。
Asymmetric synthesis of multi-substituted triptycenes via enantioselective alkynylation of 1,5-dibromoanthracene-9,10-dione
作者:Takanori Shibata、Yuri Kamimura
DOI:10.1016/j.tetasy.2014.11.012
日期:2015.1
Enantioselective alkynylation of 1,5-dibromoanthracene-9,10-dione by alkynyllithium reagents prepared from alkynes, n-BuLi, and sparteine gave chiral cis-diols possessing two alkyne moieties with moderate ee. Subsequent Ru-catalyzed [2+2+2] cycloaddition of the diol with alkynes afforded chiral 1,5-dibromotriptycenes.