A unified strategy for the synthesis of mauritines A (5), B (6), C (7), and F (10) has been developed based on a key intramolecular nucleophilicaromaticsubstitution reaction (S(N)Ar) for the formation of the strained 14-membered paracyclophane. It was demonstrated that the outcome of the cycloetherification is independent of the stereochemistry of the peptide backbone and that both (1R)-16 and (1S)-16
An Improved Asymmetric Synthesis of Unusual Amino Acid (2<i>S</i>,3<i>S</i>)‐3‐Hydroxyproline
作者:Pei‐Qiang Huang、Hui‐Ying Huang
DOI:10.1081/scc-120030686
日期:2004.12.31
three‐steps method for the conversion of N‐benzyl (S)‐3‐hydroxypyrrolidin‐2‐one 6 to (2S,3S)‐3‐hydroxyproline 1 is reported. The key step is the reductive cyanation of 6. The synthesis of 1 constitutes a formal asymmetricsynthesis of (2S,3S)‐3‐hydroxyproline betaines 2.