Regioselective Synthesis of 2<i>H</i>-Benzopyrano[3,2-<i>c</i>]quinolin-7(8<i>H</i>)-ones by Radical Cyclization
作者:K. C. Majumdar、P. P. Mukhopadhyay
DOI:10.1055/s-2003-36268
日期:——
Different 4-hydroxyquinolin-2(1H)-ones were treated with 2-bromobenzyl bromide and 2-bromo-5-methoxybenzyl bromide in the presence of anhydrous potassium carbonate in acetone to afford a number of 4-(2'-bromobenzyloxy)quinolin-2(1H)-one derivatives in 80-85% yield. These 4-(2'-bromobenzyloxy)quinolin-2-(1H)-ones were then refluxed with tributyltin chloride and sodium cyanoborohydride in benzene under