A Concise, Asymmetric Synthesis of Tetramic Acid Derivatives
作者:Santos Fustero、Marta García de la Torre、Juan F. Sanz-Cervera、Carmen Ramírez de Arellano、Julio Piera、Antonio Simón
DOI:10.1021/ol026599k
日期:2002.10.1
[reaction: see text] A simple, asymmetric synthesis of tetramicacidderivatives is described in this paper. The key step is a carbonyl transfer from carbonyldiimidazole (CDI) to alpha-diimines (I) to form N-alkyl-4-alkylamino-5-methylenepyrrol-2-ones (II). In turn, these compounds can be easily transformed into tetramicacidderivatives (III) in two additional steps.
obtained in solvent‐free conditions starting from 2,3‐butanedione and (S)‐(−)‐1‐phenylethylamine and (S)‐(−)‐1‐(4‐methylphenyl)ethylamine, respectively, yielded the newchiral mono‐Pd complexes 2a–b, which have been partly characterized by IR, 1H‐ and 13C‐NMR spectroscopies along with MS‐FAB+ spectrometry. The crystal and molecular structure for palladacycle 2a has been fully confirmed by single‐crystal