Chemistry of silylated thioketones. Part 2. Cycloaddition reactions with 1,3-dienes
Abstract
Trimethylsilylphenyl- and triphenylsilylphenyl thioketones easily undergo [4 + 2]-cycloadditions with cyclic and open chain 1,3-dienes at room temperature to give silylated thiabicyclo[2.2.1 ]heptenes and dihydrothiopyrans in very good yields. With cyclopentadiene the reaction produces exclusively the endo-silylated adducts. Sulphur oxidation and desilylation of the adducts were also investigated.