A Concise Synthesis of Berkelic Acid Inspired by Combining the Natural Products Spicifernin and Pulvilloric Acid
作者:Christopher F. Bender、Francis K. Yoshimoto、Christopher L. Paradise、Jef K. De Brabander
DOI:10.1021/ja905387r
日期:2009.8.19
defined C22 stereochemistry in seven steps and three purifications (24-28% overall yield). A potentially useful anti-selective conjugate propargylation reaction was developed to introduce the vicinal stereodiad. An enantioconvergent synthesis of the other coupling partner, the aromatic precursor to pulvilloric acid methyl ester, was achieved in eight steps and 48% overall yield. The total synthesis of berkelic
A biosynthetically inspired synthesis of (−)-berkelic acid and analogs
作者:Christopher F. Bender、Christopher L. Paradise、Vincent M. Lynch、Francis K. Yoshimoto、Jef K. De Brabander
DOI:10.1016/j.tet.2018.01.021
日期:2018.3
cycloaddition to deliver the tetracyclic core of berkelic acid. Our studies confirm that the original assigned berkelic acid structure is not stable and equilibrates into a mixture of 4 diastereomers, fully characterized by X-ray crystallography. In addition to berkelic acid, C22-epi-berkelic acid, and nor-berkelic acids, we synthesized C26-oxoberkelic acidanalogs that were evaluated against human cancer cell