Abstract
The stereoselective syntheses of a Tyr-Tyr and a Pro-Pro E-alkene isostere are described. While the Tyr-Tyr isostere was synthesized following
a convergent olefination strategy, the trisubstituted E-configured double bond of the Pro-Pro isostere was generated by an Ireland-Claisen
rearrangement. The configuration of all key intermediates containing new stereocenters
was determined by X-ray crystallography.
Key words
tyrosine - proline -
E-alkenes - Ireland-Claisen rearrangement - Julia-Kocienski olefination
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