Isoindoloisoquinalinone, pyrroloisoquinolinone and benzo[a]quinolizinone units are constructed via intramolecular cyclization of the methoxy substituted N-phenethylimides using BBr3.
isoindoloisoquinolinones, pyrroloisoquinolinones, and benzo[a]quinolizinones were successfully assembled from the corresponding imides by using a TfOH-mediated (TfOH = trifluoromethanesulfonic acid) imidecarbonylactivation and cyclization strategy. By employing this simple method, the isoquinoline alkaloids crispine A, trolline/oleracein E, and erythrinarbine were successfully synthesized in racemic form. The reaction
Organocatalytic Enantioselective Functionalization of Cyclic α-Hydroxyamides: Access to Chiral Cyclic Imides and Azapolycyclic Compounds
作者:Xiao-Qian Zhang、Yuan-Ren Ma、Yan-Kai Liu
DOI:10.1021/acs.orglett.3c03182
日期:2023.11.24
convert unfunctionalized cyclic α-hydroxyamides into chiral cyclic α-hydroxyamides by reacting with vinyl sulfones, which could be used as versatile azacyclic synthons in the following sequences: (1) as the precursors of cyclic N-acyliminium ions to prepare natural productlike chiral azapolycyclic compounds under acidic conditions and (2) to construct chiral cyclicimides bearing unilateral substituents