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 oxime derivatives. 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
在邻炔基芳基醛肟肟衍生物的银(I)催化的环化反应中发现了显着的取代作用。当R为烷基时,在110°C(条件A)下在二甲基乙酰胺中的Ag(I)催化反应以良好至极好的收率得到异喹啉,相反,异喹啉-1(2 H)-以中等至当R为乙酰基时,在条件B(二甲基甲酰胺,室温)下高收率。通过细微的结构修饰,为该产物选择性控制反应(PSCR)提出了合理的机制。