Cu-Catalyzed 1,2-Dihydroisoquinolines Synthesis from <i>o</i>-Ethynyl Benzacetals and Sulfonyl Azides
作者:Lang Sun、Yuanxun Zhu、Ping Lu、Yanguang Wang
DOI:10.1021/ol402996x
日期:2013.11.15
An efficient synthesis of 1,3-/1,1-dialkoxy 1,2-dihydroisoquinolines from o-ethynylbenzacetals and sulfonyl azides via a cascade process combining copper-catalyzed alkyne azide cycloaddition (CuAAC), Dimroth rearrangement, 1,5-OR shift/1,5-H shift, and 6 pi-electrocyclic ring closure (6 pi-ERC) is described. Extension of the produced 1,3-dialkoxy-1,2-dihydroisoquinolines to isoquinolium salts is also disclosed.