An Efficient Synthesis of [2.2.1] Heterobicyclic Pyroglutamates
作者:Srinivas Tekkam、Joseph L. Johnson、Subash C. Jonnalagadda、Venkatram R. Mereddy
DOI:10.1002/jhet.1097
日期:2013.7
A novel methodology for the efficient synthesis of [2.2.1] heterobicyclic pyroglutamates has been described. The key synthetic steps involve alkylation of amino acid‐derived iminoesters with Baylis‐Hillman bromide, RhCl3‐catalyzed exocyclic olefin isomerization, diastereoselective dihydroxylation, and regioselective lactonization. All the compounds were evaluated for their cytotoxicity using multiple