A highly efficient method for the facile access of isoquinolines and isoquinoline N-oxides via a Cu(i)-catalyzed intramolecular cyclization of (E)-2-alkynylaryl oxime derivatives in water has been developed. This protocol was performed under simple and mild conditions without organic solvent, additives or ligands. By switching on/off a hydroxyl protecting group of oximes, the selective N-O/O-H cleavage
Iodine-mediated electrophilic cyclization of 2-alkynylbenzaldoximes leading to the formation of iodoisoquinoline N-oxides
作者:Zhibao Huo、Hisamitsu Tomeba、Yoshinori Yamamoto
DOI:10.1016/j.tetlet.2008.07.061
日期:2008.9
Reaction of 2-alkynylbenzaldoximes 1 with 5 equiv of iodine in EtOH at room temperature gives the corresponding iodoisoquinoline N-oxides 2 in good to excellent yields. The cyclization proceeds very smoothly and quickly without any additives such as bases under very mild reaction conditions. (C) 2008 Elsevier Ltd. All rights reserved.
Access to Functionalized Isoquinoline<i>N</i>-Oxides<i>via</i>Sequential Electrophilic Cyclization/Cross-Coupling Reactions
作者:Qiuping Ding、Jie Wu
DOI:10.1002/adsc.200800301
日期:2008.8.4
Electrophiliccyclization of 2-alkynylbenzaldoximes with various electrophiles leads to the formation of 4-iodoisoquinoline N-oxides or 4-bromoisoquinoline N-oxides under mild conditions. The reaction can be transferred to highly functionalized isoquinoline N-oxides via palladium-catalyzed cross-couplingreactions.