作者:Xuejin Yang、Luyan Yuan、Ziyi Chen、Zhifeng Liu、Qian Miao                                    
                                    
                                        DOI:10.1021/acs.orglett.8b03099
                                    
                                    
                                        日期:2018.11.2
                                    
                                    A new trefoil-shaped molecular architecture consisting of three conjugated macrocycles was synthesized through an unprecedented 3-fold copper catalyzed [4 + 2] benzannulation. DFT calculations indicate that the most stable conformation of this trefoil macrocycle is D-3-symmetric. In agreement with the calculated results, the trefoil macrocycle in single crystals exists as a pair of enantiomers with D-3-symmetry and exhibits interesting honeycomb-like supramolecular structures.