Enantioselective Synthesis of the <i>R</i>-Enantiomer of the Feeding Deterrent (<i>S</i>)-Ypaoamide
作者:Jie Chen、Pei-Qiang Huang、Yves Queneau
DOI:10.1021/jo901557h
日期:2009.10.2
The enantioselective synthesis of the R-enantiomer of the marine natural product (S)-ypaoamide (5) is reported. The synthesis features both a flexible racemization-free approach to the 5-substituted 3-pyrrolin-2-one segment, and a lipase (CCL)-promoted deacetylation reaction to reach the orthogonal deprotection. Through this work the absolute configuration of the natural ypaoamide was determined as S.
Asymmetric Syntheses and Wnt Signal Inhibitory Activity of Melleumin A and Four Analogues of Melleumins A and B
Guided by nature: A flexible and epimerization‐free approach for the asymmetricsyntheses of melleumin A and fouranalogues of melleumins A and B was developed, which allowed confirming the stereochemistry at C‐4 of melleumin A, and revealed that the unnatural 4‐epi‐melleuminB possesses a modest inhibitoryactivity on Wntsignaling.