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Enantioselective organocatalytic α-sulfamidation of unbranched aldehydes is described using MacMillan’s second-generation imidazolidinone catalyst and o-nitrobenzenesulfonyl azide. The reactions are highly stereoselective (89.9–96.3% ee) with yields up to 71%. A strong correlation between aldehyde structure and product yield was found to exist, with 3-arylpropanals providing the best results. Application...
Ferrocenium hexafluorophosphate, Cp2FePF6, was determined to be a convenient source of cyclopentadienol when stirred open to air in a mixture of acetonitrile and water. The cyclopentadienol was intercepted via Diels–Alder reaction with a variety of dienophiles to afford cycloadducts having 7-norbornenol cores. Reactions were stereoselective, producing single diastereomers from endo approach of the...
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