Synthesis of benzocycloheptenones by 1,3-dipolar additions of 2-(1,3-benzodioxol-5-ylmethyl)-4-hydroxy-3-methoxy-carbonylisoquinolin-2-ium chloride with dipolarophiles
作者:Jeremy J. Edmunds、Xue-Min Cheng、Brian Tobias
DOI:10.1039/p19960002005
日期:——
The addition of thionyl chloride to dihydroisoquinolines affords isoquinolinium chlorides which are readily converted to the corresponding ylides upon treatment with sodium hydrogen carbonate. These ylides undergo facile1,3-dipolaradditions with dimethylacetylenedicarboxylate, maleic anhydride and acrylonitrile to afford the corresponding benzocycloheptenone cycloadduct.