Reaction of N-trityl amino acids with BOP: Efficient synthesis of t-butyl esters as well as N-trityl serine- and threonine-β-lactones
作者:Karen M Sliedregt、Arie Schouten、Jan Kroon、Rob M.J Liskamp
DOI:10.1016/0040-4039(96)00805-2
日期:1996.6
Upon exposure to methoxymethylamine and BOP, the stable hydroxybenzotriazolyl amide of TrPheOH was isolated instead of the expected Weinreb amide. This amide behaves as an active amide similar to the Weinreb amide and could be used, among others, for the synthesis of t-Bu esters. Reaction of N-trityl serine and threonine led to the corresponding β-lactones in unprecedented high yields.
Total synthesis of enterobactin via an organotin template
作者:Abraham Shanzer、Jacqueline Libman
DOI:10.1039/c39830000846
日期:——
A novel synthesis of the natural iron carrier enterobactin, based on a single step conversion of the tritylated serine β-lactone (1b) into the enterobactin skeleton (3)via the use of a cyclic organotin compound as a template, is described
Origin of the iron(III) binding and conformational properties of enterobactin
作者:Abraham. Shanzer、Jacqueline. Libman、Shneior. Lifson、Clifford E. Felder
DOI:10.1021/ja00284a026
日期:1986.11
catecholamides. Metal ions are essential for the maintenance of living systems. The alkalimetal ions such as sodium control the transmission of nerve impulses, the alkalineearthmetal ions such as calcium act as secondary messengers, and the transition-metal ions such as iron and copper are involved in enzymatic redox processes.’ A large variety of ion carriers exist in nature to control the metal ion balance
Oligo(serine ester) Charge-Altering Releasable Transporters: Organocatalytic Ring-Opening Polymerization and their Use for <i>in Vitro</i> and <i>in Vivo</i> mRNA Delivery
作者:Nancy L. Benner、Rebecca L. McClellan、Christopher R. Turlington、Ole A. W. Haabeth、Robert M. Waymouth、Paul A. Wender
DOI:10.1021/jacs.9b03154
日期:2019.5.29
of delivery systems. Here we report the first members of a new class of dynamic RNA delivery vectors, oligo(serine ester)-based charge-alteringreleasabletransporters (Ser-CARTs). Composed of lipid-containing oligocarbonates and cationic oligo(serine esters), Ser-CARTs are readily prepared (one flask) by a mild ring-opening polymerization using thiourea anions and, upon simple mixing with mRNA, readily
The fatty acid ethanolamides (FAEs) are a family of bioactive lipid mediators that include the endogenous agonist of peroxisome proliferator-activated receptor-alpha, palmitoylethanolamide (PEA). FAEs are hydrolyzed intracellularly by either fatty acid amide hydrolase or N-acylethanolamine-hydrolyzing acid amidase (NAAA). Selective inhibition of NAAA by (S)-N-(2-oxo-3-oxetanyl)-3-phenylpropionamide [(S)-OOPP, 7a] prevents PEA degradation in mouse leukocytes and attenuates responses to proinflammatory stimuli. Starting from the structure of 7a, a series of beta-lactones was prepared and tested on recombinant rat NAAA to explore structure-activity relationships (SARs) for this class of inhibitors and improve their in vitro potency. Following the hypothesis that these compounds inhibit NAAA by acylation of the catalytic cysteine, we identified several requirements for recognition at the active site and obtained new potent inhibitors. In particular, (S)-N-(2-oxo-3-oxetanyl)biphenyl-4-carboxamide (7h) was more potent than 7a at inhibiting recombinant rat NAAA activity (7a, IC(50) = 420 nM; 7h, IC(50) = 115 nM) in vitro and at reducing carrageenan-induced leukocyte infiltration in vivo.