Construction of 1,2,3-Benzodiazaborole by Electrophilic Borylation of Azobenzene and Nucleophilic Dialkylative Cyclization
作者:Masanori Shigeno、Masaya Imamatsu、Yusuke Kai、Moe Kiriyama、Shintaro Ishida、Kanako Nozawa-Kumada、Yoshinori Kondo
DOI:10.1021/acs.orglett.1c03033
日期:2021.10.15
1,2,3-Benzodiazaboroles can be conveniently prepared from azobenzenes by a two-step protocol involving electrophilic ortho-borylation with BBr3 and dialkylative cyclization with the Grignard reagent. The methodology provides a diverse range of products equipped with functionalities from azobenzenes containing substituents (Me, t-Bu, F, Cl, Br, I, and OCF3) and a series of Grignard reagents (alkyl-
1,2,3-苯并二氮杂硼可以通过两步方案方便地从偶氮苯制备,包括用 BBr 3亲电邻硼化和用格氏试剂二烷基化环化。该方法提供了多种产品,这些产品配备了含有取代基(Me、t- Bu、F、Cl、Br、I 和 OCF 3)的偶氮苯和一系列格氏试剂(烷基和芳基镁试剂)的功能。此外,该研究显示了含 B-N-N 的五元环的适度芳香性和环化反应的机理研究。