Copper(I)-Catalyzed Syntheses of Benzo[<i>b</i>]fluorenes by the Cascade Reactions of 2-Alkynylbenzaldehyde <i>N</i>-Tosylhydrazones and Aromatic Terminal Alkynes
作者:Jiaying Lv、Huixin Liu、Le Lu、Ruimao Hua
DOI:10.1021/acs.joc.2c02150
日期:2022.12.2
Benzo[b]fluorenes were synthesized via CuI-catalyzed cascade reactions of 2-alkynylbenzaldehyde N-tosylhydrazones and aromatic terminal alkynes in the presence of base including the formation of the benzoenyne–allene intermediate in situ and its Schmittel cyclization. Density functional theory calculation was performed to give the energy difference for the formation of 5-phenyl-11H-benzo[b]fluorene
苯并[ b ] 芴是通过 CuI 催化的 2-炔基苯甲醛N -甲苯磺酰腙和芳族末端炔烃在碱存在下的级联反应合成的,包括原位形成苯并炔 - 丙二烯中间体及其 Schmittel 环化。进行密度泛函理论计算以给出从所提出的双自由基中间体形成 5-苯基-11 H-苯并[ b ]芴和 1,2-二苯基-1H-环丁[ a ]茚的能量差。