Copper(I)‐Catalyzed Reactions of 2’‐Cyano‐biaryl‐2‐aldehyde N‐Tosylhydrazones with Terminal Alkynes: An Approach towards 9‐Amino‐10‐alkynylphenanthrene Modules

Abstract

AbstractHerein, we report a cascade strategy towards 9‐amino‐10‐alkynylphenanthrenes, which involves copper(I)‐catalyzed reactions of 2’‐cyano‐biaryl‐2‐aldehyde N‐tosylhydrazones and terminal alkynes in a one‐pot manner. In addition, the obtained 9‐amino‐10‐alkynylphenanthrenes could be engaged as π‐extending building blocks in the synthesis of 9H‐ dibenzo[3,4:5,6]borinino[1,2‐b]phenanthro‐[9,10‐e][1,2]azaborinine (BNTBA), a new‐type BN‐embedded PACs, which shows the different properties compared with its all‐carbon analogue tribenzo[f,k,m]tetraphene (TBA). The present synthetic method starts from easily available commercial substrates and provides a practical way for the syntheses of highly functionalized phenanthrenes and π‐extension BN‐embedded PACs.