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-step synthesis 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
据报道,从容易获得的底物向官能化的1-亚甲基异喹啉进行无金属的三步合成。首先,通过高产率的三唑化反应制备含缩醛的1,2,3-三唑,并将其定量转化为三唑并[5,1-a]异喹啉。接下来,对这些稠合三唑的酸促进的开环进行了研究,以便获得与多种亲核试剂的偶联,包括碳亲核试剂,如藜芦醛。借助无水条件下的非亲核强酸,合成了一系列前所未有的异喹啉和咪唑并[5,1-a]异喹啉。