A series of 35 analogues of Shld with modifications in the A-residue and the C-residues were prepared and investigated for binding to FKBP and GFP accumulation in transgenic plants. The modifications investigated explored variations that were supposedly inside or outside the receptor binding site with the latter being important by influencing the overall polarity of the compounds in order to improve the absorption in plants. The binding of the new compounds to the destabilizing domain was determined using a fluorescence polarization competition assay, and the GFP expression in engineered Arabidopsis thaliana was studied. The results showed that modifications of the C-building block phenol with acidic, basic, and neutral groups led to better ligands with some being better than Shld in the plant. Generally small, polar substituents showed the best GFP accumulation.
Nickel‐Catalyzed Enantioconvergent Carboxylation Enabled by a Chiral 2,2′‐Bipyridine Ligand
作者:Linghua Wang、Tao Li、Saima Perveen、Shuai Zhang、Xicheng Wang、Yizhao Ouyang、Pengfei Li
DOI:10.1002/anie.202213943
日期:2022.12.19
An enantioselective carboxylation reaction using CO2 has been demonstrated as efficient for the synthesis of chiral carboxylic acids including profen family anti-inflammatory drugs. The reaction takes place under atmospheric pressure and benefits from mild conditions using nickel-catalysis in combination with a chiral 2,2′-bipyridine ligand, namely Me-Sbpy.
使用 CO 2的对映选择性羧化反应已被证明可有效合成手性羧酸,包括普罗芬家族抗炎药。该反应在大气压力下进行,并受益于使用镍催化结合手性 2,2'-联吡啶配体(即 Me-Sbpy)的温和条件。