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。
The synthesis of l-(+)-homophenylalanine hydrochloride
摘要:
L-(+)-Homophenylalanine hydrochloride was synthesized from N-phthaloyl-L-(-)-aspartic anhydride 2 in three steps in 55% overall yield with 99% ee. (C) 2000 Elsevier Science Ltd. All rights reserved.
C-H insertion. By employing chiral diphenylethylene diamine (dpen) as ligands bearing electron-withdrawing arylsulfonyl substituents, the reactions occur with remarkable chemo- and enantioselectivities; the competing Curtius-type rearrangement was largely suppressed. Enantioselective nitreneinsertion to allylic/propargylic C-H bonds was also achieved with remarkable tolerance to the C═C and C≡C bonds
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
Metal complex, method for producing same, and method for producing gamma-lactam compound using same
申请人:INSTITUTE FOR BASIC SCIENCE
公开号:US11344872B2
公开(公告)日:2022-05-31
The present invention relates to a novel metal complex, a method for producing same, and a method for producing a gamma-lactam compound using same, and the metal complex according to the present invention is used as a catalyst for producing a gamma-lactam compound and can efficiently produce a gamma-lactam compound with an excellent yield and excellent selectivity.
NOVEL METAL COMPLEX, METHOD FOR PRODUCING SAME, AND METHOD FOR PRODUCING GAMMA-LACTAM COMPOUND USING SAME
申请人:INSTITUTE FOR BASIC SCIENCE
公开号:US20200330969A1
公开(公告)日:2020-10-22
The present invention relates to a novel metal complex, a method for producing same, and a method for producing a gamma-lactam compound using same, and the metal complex according to the present invention is used as a catalyst for producing a gamma-lactam compound and can efficiently produce a gamma-lactam compound with an excellent yield and excellent selectivity.
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。