A Straightforward Approach towards Functionalized γ-Hydroxy and Heterocyclic Amino Acids
作者:Uli Kazmaier、Ameer Zahoor
DOI:10.1055/s-0030-1260136
日期:2011.9
Regioselective ring opening of epoxides by chelated enolates in combination with Dess-Martin oxidation provides a straightforward approach towards γ-oxo amino acids, which are ideal substrates for carbonyl additions and the synthesis of heterocycles.
A straightforward approach towards combined α-amino and α-hydroxy acids based on Passerini reactions
作者:Ameer F Zahoor、Sarah Thies、Uli Kazmaier
DOI:10.3762/bjoc.7.151
日期:——
Complex amino acids with an alpha-acyloxycarbonyl functionality in the side chain are easily available through epoxide opening by chelated enolates and subsequent oxidation/Passerini reaction. This protocol works with both, aldehyde and ketone intermediates, as long as the ketones are activated by electron-withdrawing groups. In principle Ugi reactions are also possible, allowing the generation of
通过螯合烯醇化物和随后的氧化/Passerini 反应,通过环氧化物开环很容易获得在侧链中具有 α-酰氧羰基官能团的复杂氨基酸。该协议适用于醛和酮中间体,只要酮被吸电子基团激活。原则上 Ugi 反应也是可能的,允许生成二氨基酸衍生物。