Simple synthetic route to polyhydroxylated pyrrolidines and piperidines
β Scribed by Sang Gyeong Lee; Yong-Jin Yoon; Ki Hun Park
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1998
- Tongue
- English
- Weight
- 368 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0022-152X
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β¦ Synopsis
Abstract
A short and simple synthetic route to polyhydroxylated piperidines and pyrrolidines were described with DβglucuronoβΞ΄βlactone as chiral educt. Key reaction steps included selective cleavage of terminal isopropylidene group of compound 12 with Dowex 50WβX8 resin (H^+^ form), regioselective ring opening of epoxide 16 and intramolecular nucleophilic amination of compound 14 and 18.
π SIMILAR VOLUMES
Cyciiition of r,b-alkenylimines with bromine in dichloromethane gave instantaneous formation of cyclic iminium bromides, which were converted into either pyrrolidines or piperidines, depending upon the substitution pattern. This reaction has been applied in the synthesis of 2.azaspiro compounds.
Intramolecular nitrile oxide olefin cycloaddition (INOC) reactions of oximes 1-3 and of 24-27 derived from l-amino acids have been found to proceed stereoselectively, yielding tricyclic fused pyrrolidines and piperidines. Further manipulation led to chiral hydroxymethyl-substituted fused piper-
SumWWY: Starting from geranyl acetate, efficient routes to O(ZH)-furanone derivatives via allylic