Flexible, Phase-Transfer Catalyzed Approaches to 4‑Substituted Prolines

A range of 4-substituted prolines can be rapidly synthesized from a protected glycine Schiff base in only four steps and in 27–55% overall yield. Phase transfer catalysis allows direct access to both enantiomeric series, and the relative stereochemistry at the 4-position is readily controlled (>1...

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Bibliographic Details
Published in:Organic letters 2014-09, Vol.16 (18), p.4778-4781
Main Authors: Johnston, Heather J, McWhinnie, Fergus S, Landi, Felicetta, Hulme, Alison N
Format: Article
Language:English
Subjects:
Catalysis
Glycine - chemistry
Hydrogenation
Molecular Structure
Oligopeptides - pharmacology
Proline - analogs & derivatives
Proline - chemical synthesis
Proline - chemistry
Schiff Bases
Stereoisomerism
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Summary:A range of 4-substituted prolines can be rapidly synthesized from a protected glycine Schiff base in only four steps and in 27–55% overall yield. Phase transfer catalysis allows direct access to both enantiomeric series, and the relative stereochemistry at the 4-position is readily controlled (>10:1 dr) through the choice of hydrogenation conditions.
ISSN:1523-7060
1523-7052
DOI:10.1021/ol502239g