Concise Total Synthesis of (±)-Salinosporamide A, (±)-Cinnabaramide A, and Derivatives via a Bis-cyclization Process: Implications for a Biosynthetic Pathway?
作者:Gil Ma、Henry Nguyen、Daniel Romo
DOI:10.1021/ol070616u
日期:2007.5.1
(hetero ketene dimers) and alpha-amino acids are useful precursors for total syntheses of the beta-lactone-containing proteasomeinhibitors salinosporamide A, cinnabaramide A, and derivatives. A key step is a nucleophile-promoted, bis-cyclization of keto acids that simultaneously generates the gamma-lactam and beta-lactone of these natural products. This reaction sequence may have implications for the
The present invention provides a concise synthetic method for generating lactam-fused beta-lactones that feature, in some embodiments, a tertiary fused carbinol, quaternary carbons, and a reactive beta-lactone moiety available for further reactions. The present invention further provides compounds synthesized by this method as well as methods of using these compounds as inhibitors of the proteasome and fatty acid synthase.