<i>Homo-Freidinger</i> Lactams: Stereoselective Synthesis of 4-Aminopiperidin-2-one Derivatives from Aspartic Acid
作者:Klaus Weber、Peter Gmeiner
DOI:10.1055/s-1998-1786
日期:1998.8
reduction of the azide functionality in the presence of the nitrile group was accomplished under Staudinger conditions 21giving the amino nitrile 3b in 81 % yield. Alternatively, a more direct preparation of 3b is possible when liquid NH3 is used as the "second nucleophile" instead of NaN3.22 Lactamization of the amino nitrile 3b was induced by HClIMeOH. The reaction sequence is highly practical and efficient
Enantiopure 4- and 5-Aminopiperidin-2-ones: Regiocontrolled Synthesis and Conformational Characterization as Bioactive β-Turn Mimetics
作者:Klaus Weber、Ursula Ohnmacht、Peter Gmeiner
DOI:10.1021/jo000555c
日期:2000.11.1
gamma-amino acid equivalents. Using the 1,4-bis-electrophile 1b as a central intermediate, the 4- and 5-aminopiperidin-2-ones 4 and 8, respectively, were approached by regioselective functionalization and subsequent lactamization. Diastereoselective C-alkylation was performed after N-protection of the lactam functionality when exclusive trans configuration resulting in the formation of 5a-f was observed in