A Synthetic Route to β-Hydroxytyrosine-Derived Tetramic Acids: Total Synthesis of the Fungal Metabolite F-14329
作者:Sebastian Bruckner、Robert G. Haase、Rainer Schobert
DOI:10.1002/chem.201701259
日期:2017.4.27
derived from β‐hydroxytyrosine are synthetically challenging. The first route to this structural motif, based upon a condensation between a Meldrum's acid conjugate bearing the acyl side chain, and a β‐hydroxytyrosinate, N‐protected by an ortho‐nitrobenzyl group is presented. This group enables the Dieckmann cyclization of the resulting N‐(β‐ketoacyl)amino ester, after which it can be removed photolytically
从β-羟基酪氨酸衍生的3-酰基四酸在合成上具有挑战性。基于带有酰基侧链的Meldrum酸共轭物和受邻硝基苄基基团N保护的β-羟基酪氨酸盐之间的缩合,给出了通往该结构基序的第一条路线。该基团可对所得的N-(β-酮酰基)氨基酯进行Dieckmann环化反应,然后可以光解法将其除去,而不会破坏精密的3'-羟基。该策略适用于真菌代谢产物F-14329的首次全合成(1)。