Diels-alder reactions with cyclic sulfones: VIII. Organic catalysis in the synthesis of spiro[1-benzothiophene-4,5′-pyrimidine]-2′,4′,6′-trione 1,1-dioxides and 2′-thioxospiro[1-benzothiophene-4,5′-pyrimidine]-4′,6′-dione 1,1-dioxides
Russian Journal of Organic Chemistry Volume 45, Number 1 p 87-101
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http://dx.doi.org/10.1134/S1070428009010126Russian Journal of Organic Chemistry Volume 40, Number 6 p. 854-865
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http://dx.doi.org/10.1023/B:RUJO.0000044549.81561.4f