Multigram-scale synthesis of L-azetidine-2-carboxylic acid from L-aspartic acid was achieved in 13 conventional synthetic steps, without the need for purification by silica-gel column chromatography and expensive reagents. Nicotianamine and its fluorescence-labeled derivatives could be obtained from this synthetic strategy.
Multigram-scale synthesis of L-azetidine-2-carboxylic acid from L-aspartic acid was achieved in 13 conventional synthetic steps, without the need for purification by silica-gel column chromatography and expensive reagents. Nicotianamine and its fluorescence-labeled derivatives could be obtained from this synthetic strategy.
Live-Cell Protein Modification by Boronate-Assisted Hydroxamic Acid Catalysis
作者:Christopher Adamson、Hidetoshi Kajino、Shigehiro A. Kawashima、Kenzo Yamatsugu、Motomu Kanai
DOI:10.1021/jacs.1c07060
日期:2021.9.22
Selective methods for introducing protein post-translational modifications (PTMs) within living cells have proven valuable for interrogating their biological function. In contrast to enzymatic methods, abiotic catalysis should offer access to diverse and new-to-nature PTMs. Herein, we report the boronate-assisted hydroxamic acid (BAHA) catalyst system, which comprises a protein ligand, a hydroxamic
base-induced Sommelet–Hauser (S–H) rearrangement of azetidine-2-carboxylic acid ester-derived ammonium salts into 2-aryl-substituted derivatives was demonstrated. The ring-strain of four-membered N-heterocycles enables efficient generation of the desired ylide intermediate and enhances the rate of the S–H rearrangement. The asymmetric version of the rearrangement was characterized by excellent levels of
A straightforward synthesis of L-azetidine-2-carboxylicacid is described, leading to both orthogonally protected versions or totally deprotected L-Aze. The starting material is a commercially available aspartic acid derivative, whose chirality is conserved. The (2-trimethylsilyl)ethanesulfonyl protecting group (SES) acts as a leaving group on the hydroxy function and serves as an activator for the
An efficient synthesis of nicotianamine has been achieved by using a new strategy based on N-alkylation. Sulfonamide activation proved to be necessary for the alkylation of the primary amine and the 2-(trimethylsilyl)ethanesulfonylgroup was easily introduced and found to provide the best compromise for the N-alkylation and deprotection reactions. This new strategy enabled the preparation of several
Stereoselective totalsynthesis of the unique phytosiderophores, 2′-deoxymugineicacid(4) and nicotianamine (5), has been achieved from the β-tyrosine derivative 21 using its aryl groups as the carboxyl synthon.