The glutamicacid moiety of N-[4-[3-(2,4-diamino-7H-pyrrolo[2,3-d]pyrimidin-5-yl)propyl]benzoyl]-L-g lutamic acid (1b, TNP-351) and the related compound (1a), was replaced with various N(omega)-acyl-, sulfonyl-, carbamoyl- and aryl-2,omega-diaminoalkanoic acids, and the inhibitory effects of the resulting products (9, 11, 14, 18, 21, 23, 25, 30, 36) on dihydrofolate reductase (DHFR), the growth of
Synthesis of Medium- and Large-Ring Compounds Initiated by Photochemical Decarboxylation of ω-Phthalimidoalkanoates
作者:Axel G. Griesbeck、Andreas Henz、Wolfgang Kramer、Johann Lex、Frank Nerowski、Michael Oelgemöller、Karl Peters、Eva-Maria Peters
DOI:10.1002/hlca.19970800324
日期:1997.5.12
reaction initiated by intramolecular photo electron transfer is described. Ring sizes available by this method span from 4 (benzazepine-1,5-dione 7) to 26 (cyclodipeptide 26e). Ground-state template formation is proposed as the explanation for the high efficiency of this reaction and for the decrease in reactivity in the presence of organic bases instead of metal carbonates. The crucial step in this
General Access to Modified α‐Amino Acids by Bioinspired Stereoselective γ‐C−H Bond Lactonization
作者:Laia Vicens、Massimo Bietti、Miquel Costas
DOI:10.1002/anie.202007899
日期:2021.2.23
show that the use of bioinspired manganese catalysts and H2O2 under mild conditions, provides access to modified α‐amino acids via γ‐C−H bond lactonization. The system can efficiently target 1°, 2° and 3° γ‐C−H bonds of α‐substituted and achiral α,α‐disubstituted α‐amino acids with outstanding site‐selectivity, good to excellent diastereoselectivity and (where applicable) enantioselectivity. This methodology
α‐氨基酸代表了宝贵的一类天然产物,被用作生物和化学合成的基础。由于可用的天然氨基酸数量有限,并且它们在蛋白质组学,诊断,药物递送和催化中的广泛应用,对开发制备修饰的类似物的方法的需求日益增加。在这里,我们表明使用了生物启发性的锰催化剂和H 2 O 2在温和的条件下,可通过γ-C-H键内酯化作用获得修饰的α-氨基酸。该系统可有效靶向α-取代的和非手性α,α-二取代的α-氨基酸的1°,2°和3°γ-C-H键,具有出色的位点选择性,良好的非对映选择性和(如果适用)对映选择性。该方法可以被认为是完善的有机金属程序的替代方法。
Chiral sensors for determining the absolute configurations of α-amino acid derivatives
作者:Zhongxiang Chen、Hongjun Fan、Shiwei Yang、Guangling Bian、Ling Song
DOI:10.1039/c8ob01933a
日期:——
A simple strategy for configurational assignments of alpha-amino acids has been developed by comparison of the proton NMR chemical shift values of the alpha hydrogens of N-phthaloyl protected alpha-amino acids in the presence of (R)-CSA 1 and (S)-CSA 1, respectively. Highly resolved NMR spectra can be obtained directly on the mixed solution of the chiral solvating agents with N-phthaloyl protected