Synthesis of 2H-1-Benzopyran-2,4(3H)-dione-3-carboxamide and 2H,3H-[1]Benzopyrano[4,3-b]pyrano-2-hydroxy-3-carboxamide-4,5-dione Derivatives via Carbon Suboxide
作者:Leonardo Bonsignore、Giuseppe Loy
DOI:10.3987/com-97-7885
日期:——
The reaction of substituted 2-hydroxybenzamides with carbon suboxide is described. By varying the weight ratio of the reagent, this reaction leads to the coumarin and/or pyranocoumarin derivatives in one step and with satisfactory yields.
Anschuetz, Justus Liebigs Annalen der Chemie, 1909, vol. 367, p. 174