The osmium trichloride-catalyzed oxidation with peracetic acid of olefinic compounds bearing a protected α-amino acidgroup leads to α-ketol aminoacid precursors related to the 5-Hydroxy-4-Oxo-Norvaline antibiotic.
A diastereoselective tandem RCM approach to spiropiperidines
作者:Robert A.J. Wybrow、Andrew S. Edwards、Neil G. Stevenson、Harry Adams、Craig Johnstone、Joseph P.A. Harrity
DOI:10.1016/j.tet.2004.07.025
日期:2004.9
This paper outlines the stereocontrolled synthesis of a functionalised spiropiperidine through a diastereoselective tandem RCM reaction. The diastereoselectivity of this process was found to be strongly dependant on the nature of the catalyst; the less active first generation Ru-carbene complexes provided the desired spirocycle in high yield and with good stereocontrol. Additionally, the further functionalisation of the spiropiperidine was carried out through a regio- and stereoselective dihydroxylation reaction employing Donohoe's OsO4-TMEDA conditions. (C) 2004 Elsevier Ltd. All rights reserved.
N-Alkylation of diethyl acetamidomalonate: synthesis of constrained amino acid derivatives by ring-closing metathesis
作者:Sambasivarao Kotha、Kuldeep Singh
DOI:10.1016/j.tetlet.2004.11.013
日期:2004.12
An efficient method for N-alkylation of diethyl acetamidomalonate (DEAM) is reported. C-Alkenylation was achieved by treating the N-alkenylated DEAM with various electrophiles in the presence Of Cs2CO3. RCM reactions of C- and N-alkenylated products gave cyclic amino acid derivatives in good yields. (C) 2004 Published by Elsevier Ltd.
α-Amino alkanoic and alkenoic acids with perfluoroalkyl terminal segments
作者:Neal O. Brace
DOI:10.1021/jo01288a037
日期:1967.2
Electrochemical Synthesis of Unnatural Amino Acids via Anodic Decarboxylation of <i>N</i>-Acetylamino Malonic Acid Derivatives
作者:Olesja Koleda、Katrina Prane、Edgars Suna
DOI:10.1021/acs.orglett.3c02687
日期:2023.11.10
α-disubstituted cyclic amino acidderivatives in medicinal chemistry urges for analogue design with improved pharmacokinetic properties. Herein, we disclose an electrochemical approach toward unnatural THF- and THP-containing amino acidderivatives that relies on anodic decarboxylation-intramolecular etherification of inexpensive and readily available N-acetylamino malonicacid monoesters under Hofer–Moest
α,α-二取代环状氨基酸衍生物在药物化学中的广泛应用迫切需要具有改进的药代动力学特性的类似物设计。在此,我们公开了一种针对非天然含THF和THP的氨基酸衍生物的电化学方法,该方法依赖于廉价且容易获得的N-乙酰氨基丙二酸单酯在Hofer-Moest反应条件下的阳极脱羧-分子内醚化。脱羧环化在恒定电流条件下在未分裂的细胞中在水性介质中进行,无需添加任何碱。在组织蛋白酶 K 抑制剂 balicatib 中,用含 THP 的氨基酸支架成功生物等排取代 1-氨基环己烷-1-羧酸亚基,有助于降低亲脂性,同时保留低纳摩尔酶抑制效力和相当的微粒体稳定性。