Novel methodologies for the synthesis of functionalized pyroglutamates
作者:Srinivas Tekkam、M. A. Alam、Subash C. Jonnalagadda、Venkatram R. Mereddy
DOI:10.1039/c0cc05609j
日期:——
bromides furnished alpha-methylene-beta-substituted-pyroglutamates, while the corresponding alkylation with BH derived allylic acetates provided alpha-alkylidene-pyroglutamates. These methodologies have been applied in the synthesis of fused [3.2.0]-gamma-lactam-beta-lactones.
Concise Synthesis of α-Methylene-β-hydroxy-γ-carboxy-γ-lactams
作者:Srinivas Tekkam、Joseph L. Johnson、Subash C. Jonnalagadda、Venkatram R. Mereddy
DOI:10.1002/jhet.1578
日期:2013.7
A concise protocol for the synthesis of α‐methylene‐β‐hydroxy‐γ‐carboxy‐γ‐lactams has been described via alkylation of amino acid derived iminoesters with α‐bromomethylmethacrylate, followed by allylic hydroxylation. All the synthesized compounds have been evaluated for their cytotoxicity on multiple myeloma cancer cell lines.
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