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.
Chemoselective Hydrogenation Reaction of Unsaturated Bonds in the Presence of an o-Nitrobenzenesulfonyl Group
摘要:
Chemoselective hydrogenation of unsaturated compounds bearing an o-nitrobenzenesulfonyl (Ns)-amide moiety, affording the corresponding saturated compounds, was accomplished efficiently without loss of the nitro group by using the Pd/MS3A catalyst and a H-2 balloon. Partial hydrogenation of alkynes bearing an Ns group to corresponding cis alkenes was achieved with the combination of the Pd/BN catalyst and an additive (diethylenetriamine or acetic acid).