The reaction of benzofuran-2,3-dione derivatives with dialkyl
acetylenedicarboxylates (DAAD) and isoquinoline results in a three-component
1,4-dipolar cycloaddition reaction in which the ester carbonyl group
is incorporated into a two-atom assembly to give spiro[1,3]oxazino[2,3-a]isoquinoline derivatives in
good yield. This reaction provides the first example of an ester
carbonyl group participating in a 1,4-dipolar cycloaddition reaction.
benzofuran-2,3-dione - dialkyl acetylenedicarboxylates - isoquinolines - spiro[1,3]oxazino[2,3-a]isoquinolines - multicomponent
reactions