M. Shindo et al., The first tandem [2+2] cycloaddition-Michael reaction using ynolates: Facile construction of substituted carbocycles, ORG LETT, 3(13), 2001, pp. 2029-2031
[GRAPHICS]
A tandem [2 + 2] cycloaddition-Michael reaction using ynolate anions follow
ed by decarboxylation produced polysubstituted five-, six-, and seven-membe
red cycloalkenes.