Abstract
AbstractWe report a strategy for the construction of tetrahydro‐1H‐1λ6‐pyrrolo[1,2‐b]isothiazole‐1,1,3(2H)‐triones bearing the substituents at the 5‐ and/or 3a‐positions. To this purpose, a range of 2‐substituted and 2,4‐disubstituted methyl 2‐pyrrolidinecarboxylates were sulfonylated with methanesulfonyl chloride and the resulting sulfonamides were subjected to sulfa‐Dieckmann condensation through the CSIC (Carbanion mediated Sulfonate (Sulfonamido) Intramolecular Cyclization) reaction to give the desired 1λ6‐isothiazolidine‐1,1,4‐triones. All the precursors, as well as target compounds, could be synthesized in a multigram scale following the general protocols.
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