An N-heterocyclic carbene-catalyzed switchable reaction of 9-(trimethylsilyl)fluorene and aldehydes: chemoselective synthesis of dibenzofulvenes and fluorenyl alcohols
作者:Yu-Chuan Ma、Jin-Yun Luo、Shi-Chu Zhang、Shu-Hui Lu、Guang-Fen Du、Lin He
DOI:10.1039/d1ob00065a
日期:——
carbene-catalyzed synthesis of dibenzofulvenes and fluorenyl alcohols was developed. In the presence of 10 mol% NHC (1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) and 4 Å molecular sieves, 9-(trimethylsilyl)fluorene undergoes an olefination reaction with aldehydes to produce dibenzofulvenes in 43–99% yields. However, on reducing the NHC loading to 1 mol% and with the addition of water, 9-(trimethylsilyl)fluorene
开发了N-杂环卡宾催化的二苯并富勒烯和芴醇的合成。在10摩尔%NHC(1,3-双(2,6-二异丙基苯基)咪唑-2-亚基)和4Å分子筛的存在下,9-(三甲基甲硅烷基)芴与醛进行烯化反应以在43中生成二苯并富烯–99%的收益率。但是,在将NHC含量降至1 mol%并添加水后,9-(三甲基甲硅烷基)芴选择性地与醛进行了亲核加成反应,从而以40-95%的产率获得了芴醇。