Synthesis of Substituted Coumarins and 2-Quinolinones by Cycloisomerisation of (Hydroxy/aminophenyl)propargyl Alcohols

[摘要]：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 converted into the quinolinone by acid treatment. N-Protected intermediate 8 was isolated and converted into the quinolinone [with In(OTf)3 or H2SO4] or the 3-iodo-2-quinolinone (with I2 and H+).

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