Abstract trans-Stereoselective electrophilic cyclization of (2 R*, SS*)-N, N-diisopropyl-2- phenylsulfinylpent-4-enamide under the action of bromine afforded (3 R*, 5 S*, SS*)-N-(5- bromomethyl-3-phenylsulfinyltetrahydrofuran-2-ylidene)-N, N-diisopropylammonium bromide. Its transformations under the conditions of hydrolysis, dehydrobromination, and hydride reduction were studied.
