摘要
Comprehensive Summary Metallacyclopentadienes play a vital role in transition-metal mediated and catalyzed cycloaddition reactions of alkynes.Though versatile reactions of metallacyclopentadienes with alkynes have been disclosed,[2+1]cycloadditions of metallacyclopentadienes and alkynes have never been discovered.In present work,we report the formal[2+1]cycloadditions of a metallacyclopentadiene unit with a broad scope of commercial alkynes,providing a facile strategy to construct tetracyclic conjugated compounds.The deuterated experiment indicates a metal vinylidene intermediate has been involved in[2+1]cycloaddition.Moreover,the electrophilic substitution reaction of the tetracyclic conjugated compound with the aid of density functional theory(DFT)calculated Fukui functions is investigated.
基金
the National Natural Science Foundation of China(Nos.21931002,22071098,22101115,and 22101123)
the Shenzhen Science and Technology Innovation Committee(Nos.JCYJ20200109140812302 and JCYJ20210324105013035)
the Guangdong Provincial Key Laboratory of Catalysis(No.2020B121201002)。
