A Dramatic Substituent Effect in Silver(I)-Catalyzed Regioselective Cyclization of ortho-Alkynylaryl Aldehyde Oxime Derivatives
作者:Hongyin Gao、Junliang Zhang
DOI:10.1002/adsc.200800568
日期:2009.1
A dramatic substituent effect was found in the silver(I)-catalyzed cyclization reaction of ortho-alkynylaryl aldehyde oximederivatives. When R is an alkyl group, the Ag(I)-catalyzed reaction in dimethylacetamide at 110 °C (conditions A) affords isoquinolines in good to excellent yields, in contrast, isoquinolin-1(2 H)-ones were produced in moderate to high yields under conditions B (dimethylformamide
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.