Diels–Alder Reactions with Cyclic Sulfones: VII. Synthesis of 1-Benzothiophene 1, 1-Dioxide Derivatives

…, AA Volkov, MM Shakirov, IY Bagryanskaya…

Index: Andreev; Shul'ts; Volkov; Shakirov; Bagryanskaya; Gatilov; Tolstikov Russian Journal of Organic Chemistry, 2004 , vol. 40, # 6 p. 854 - 865

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Citation Number: 8

Abstract

Abstract 5-Arylmethylene-2, 2-dimethyl-1, 3-dioxane-4, 6-diones reacted with 5-isopropenyl- 2, 3-dihydrothio-phene 1, 1-dioxide to give the corresponding ortho-addition products, 5-aryl- 2', 2', 7-trimethyl-3, 3a, 5, 6-tetra-hydro-2 H-spiro [1-benzothiophene-4, 5'-[1, 3] dioxane]-4', 6'-dione 1, 1-dioxides. Their aminolysis resulted in opening of the 1, 3-dioxane ring and formation of 4-carbamoyl-7-methyl-2, 3, 3a, 4, 5, 6-hexahydro-1-benzo-thiophene-4- ...