1,2,3-Triazole-Mediated Synthesis of 1-Methyleneisoquinolines: A Three-Step Synthesis of Papaverine and Analogues
作者:Tomas Opsomer、Max Van Hoof、Andrea D’Angelo、Wim Dehaen
DOI:10.1021/acs.orglett.0c01069
日期:2020.5.1
A metal-free three-stepsynthesis toward functionalized 1-methyleneisoquinolines from readily available substrates is reported. First, acetal-containing 1,2,3-triazoles were prepared via a high-yielding triazolization reaction and quantitatively converted into triazolo[5,1-a]isoquinolines. Next, the acid-promoted ring opening of these fused triazoles was studied in order to obtain coupling to a diverse