The synthesis of (2S,4R)- and (2R,4R)-4-hydroxypipecolic acid has been realized from commercial ethyl (R)-4-cyano-3-hydroxybutanoate through palladium-catalyzed methoxycarbonylation of a 4-hydroxy-substituted lactam-derived vinyl phosphate followed by the stereocontrolled reduction of the enamine double bond. The stereoselectivehydrogenation of the suitably 4-hydroxy-protected enantiomer afforded
Stereoselective Synthesis of (2S,4R)-4-Hydroxypipecolic Acid
作者:Ernesto G. Occhiato、Dina Scarpi、Antonio Guarna
DOI:10.1002/ejoc.200700849
日期:2008.1
A new synthetic route to enantiopure (2S,4R)-4-hydroxypipecolicacid from commercial ethyl (3S)-4-chloro-3-hydroxybutanoate is reported. The synthesis is based on the Pd-catalyzed methoxycarbonylation of a 4-alkoxy-substituted δ-valerolactam-derived vinyl triflate followed by the stereocontrolled hydrogenation of the enamine double bond. The final product was obtained after exhaustive hydrolysis in
Enantioselective Synthesis of <i>cis</i>
and <i>trans</i>
4-Aminopipecolic Acids as γ-Amino Acids for the Construction of Cyclic RGD-Containing Peptidomimetics Antagonists of α<sub>V</sub>
β<sub>3</sub>
Integrin
作者:Francesca Dordoni、Dina Scarpi、Francesca Bianchini、Alessandro Contini、Ernesto G. Occhiato
DOI:10.1002/ejoc.202000634
日期:2020.8.2
A stereodivergent preparation of cis and trans 4‐aminopipecolic acids (4‐APAs) was developed from a common precursor to obtain suitably protected, constrained γ‐amino acids useful in peptidomimetic synthesis. Two antagonists of αVβ3 integrin were synthesized.