Novel synthesis of 2,3-dihydrobenzofuran-3-amines from salicylic aldehydes: Trimethylsilyl as traceless activating group
作者:Polina A. Khardina、Evgeny M. Buev、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tetlet.2024.154992
日期:2024.4
Salicylic aldehydes were readily alkylated with (chloromethyl)trimethylsilane to give silylated -methoxy benzaldehydes in 85–96 % yields. These aldehydes were converted into alkyl and aryl imines in excellent yields. -(Trimethylsilyl)methyl moiety was applied as the synthetic equivalent of aryloxymethyl anion in the nucleophilic cyclization at the imine group promoted by CsF in DMF at 140 °C. Using
水杨醛很容易用(氯甲基)三甲基硅烷烷基化,得到甲氧基苯甲醛,产率 85-96%。这些醛以优异的产率转化为烷基亚胺和芳基亚胺。 -(三甲基甲硅烷基)甲基部分用作芳氧基甲基阴离子的合成等价物,在 CsF 在 DMF 中于 140 °C 促进的亚胺基团亲核环化中进行。使用这种无痕方法,通过三步从水杨醛合成 2,3-二氢苯并呋喃-3-胺,收率 25-55%。