Acid-catalyzed regioselective sulfamination of γ-amino–alkenes and stereoselective rearrangement of pyrrolidines to piperidines
摘要:
This paper describes efficient acid-catalyzed regioselective sulfamination of gamma-amino-alkenes to form pyrrolidines and stereoselective rearrangement of pyrrolidines to piperidines. A possible reaction mechanism has been proposed. (c) 2012 Elsevier Ltd. All rights reserved.
The biomimetic construction of fused cyclic polyethers
摘要:
The formation of fused cyclic ethers by biomimetic synthesis was demonstrated. The one-pot successive ring-expansion reactions of bromo diepoxides were investigated by regarding the epoxy groups as the nucleophiles for the intramolecular cationic carbons to obtain the fused cyclic ethers. (C) 1997 Elsevier Science Ltd.