Synthesis of Substituted Coumarins and 2-Quinolinones by Cycloisomerisation of (Hydroxy/aminophenyl)propargyl Alcohols
作者:Maddi Sridhar Reddy、Nuligonda Thirupathi、Madala Hari Babu
DOI:10.1002/ejoc.201200782
日期:2012.10
A new cycloisomerization strategy for the synthesis of coumarins and quinolinones is described. The addition of ethoxyacetylide to 2-hydroxyacetophenones directly resulted in 4-substituted coumarins by 6-endo-dig cycloisomerisation of the intermediate 3-ethoxy-1-(2-hydroxyphenyl)-2-propyn-1-ols. Under similar conditions, 2-aminoacetophenone produced 2-ethoxyquinoline, a masked quinolinone, which was