Add time:07/13/2019         Source:sciencedirect.com

1,1-Dihydro-1-tolylsulfonyl polyfluoroalkan-2-ones react with phthalimidosulfenyl chloride to form sulfenylated products on the active methylene group, 1-phthalimidothio-1-tolylsulfonyl polyfluoroalkan-2-ones. Decomposition of the latter leads to formation of 1-thioxo-1-tolylsulfonyl polyfluoroalkan-2-ones. These compounds undergo easily the hetero Diels–Alder reaction with electron-rich 1,3-dienes as dienophiles to give polyfluoroalkanoyl substituted derivatives of 5,6-dihydro-2H-thiins. 6-Arylsulfonyl-6-polyfluoroalkanoyl-5,6-dihydro-2H-thiins obtained react with alkali to give 5,6-dihydro-6-p-tolylsulfonyl-2H-thiins and with methanol to give 2-polyfluoroalkanoyl-6H-thiins.

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