Dopamine .beta.-monooxygenase-catalyzed aromatization of 1-(2-aminoethyl)-1,4-cyclohexadiene: redirection of specificity and evidence for a hydrogen-atom-transfer mechanism
hydrogen-deuterium (H-D) exchange reaction on the benzylic site proceeded in D2O in the presence of a small amount of H2 gas. The use of the Pd/C-ethylenediamine complex [Pd/C(en)] as a catalyst instead of Pd/C led to the efficient deuterium incorporation into the benzylic site of O-benzyl protective groups without hydrogenolysis. These H-D exchange reactions provide a post synthetic and D(2)-gas-free deuterium-labeling
Preparation of Deuterium Labeled Compounds by Pd/C-Al-D2O Facilitated Selective H-D Exchange Reactions
作者:Anne Kokel、Dora Kadish、Béla Török
DOI:10.3390/molecules27030614
日期:——
The chemo/regioselective H-D exchange of amino acids and synthetic building blocks by an environmentally benign Pd/C-Al-D2O catalytic system is described. Due to the importance of isotope labeled compounds in medicinal chemistry and structural biology, notably their use as improved drug candidates and biological probes, the efficient and selective deuteration methods are of great interest. The approach
描述了通过环境友好的 Pd/C-Al-D2O 催化系统对氨基酸和合成构件进行化学/区域选择性 HD 交换。由于同位素标记化合物在药物化学和结构生物学中的重要性,特别是它们作为改进的候选药物和生物探针的用途,因此有效和选择性的氘代方法引起了人们的极大兴趣。该方法基于选择性 HD 交换反应,其中氘源是简单的 D2O。D2 气体是由铝和 D2O 的反应原位产生的,而市售的钯催化剂则有助于 HD 交换反应。高选择性和效率,以及程序的简单性和安全性使该方法成为当前替代方法的环境友好型替代方法。
Discovery and Characterization of Pyridoxal 5′-Phosphate-Dependent Cycloleucine Synthases
作者:Abner N. D. Abad、Kaushik Seshadri、Masao Ohashi、David A. Delgadillo、Lygia S. de Moraes、Kyle K. Nagasawa、Mengting Liu、Samuel Johnson、Hosea M. Nelson、Yi Tang
DOI:10.1021/jacs.4c02142
日期:2024.5.29
5′-phosphate (PLP)-dependent enzymes are the most versatile biocatalysts for synthesizing nonproteinogenic aminoacids. α,α-Disubstituted quaternary aminoacids, such as 1-aminocyclopentane-1-carboxylic acid (cycloleucine), are useful building blocks for pharmaceuticals. In this study, starting with the biosynthesis of fusarilin A, we discovered a family of PLP-dependent enzymes that can facilitate tandem carbon–carbon