A series of 3-(arylalkyl)-2,4,5-trioxoimidazolidine-1-acids (1) was prepared and tested for aldose reductase (AR) and aldehyde reductase (ALR) inhibitory activities. These compounds showed strong inhibitory activity against AR without significant inhibitory activity for ALR. The ratio of IC50(ALR)/IC50(AR) was > 1000 in some compouds. On the basis of pharmacological tests such as the recovery of reduced motor nerve conduction velocity and toxicological profile, 3-(3-nitrobenzyl)-2,4,5-trioxoimidazolidine-1-acid (NZ-314) was selected as the candidate for clinical development.
Phenethylamines via Heck arylation of a new vinylamine equivalent
摘要:
A new vinylamine equivalent, N-vinyloxazolone 3, has been prepared in three steps and shown to undergo Heck arylation with a variety of substrates. The Heck adducts thus obtained are then converted in one step and high yield to phenethylamine hydrochlorides. As a general synthetic method for preparation of substituted phenethylamines, use of this new reagent is shown to be superior to N-vinylphthalimide in number of steps, regiospecificity, and chemical yield.
reported and its catalytic activity towards the reduction of ketones and nitriles is studied. On comparing the reactivity of various other Mn(I) complexes supported by benzimidazole ligand, it was observed that the Mn(I) complexes bearing 6-methylpyridine and benzimidazole fragments exhibited the highest catalytic activity towards monohydrosilylation of ketones and dihydrosilylation of nitriles. Using this
Phosphine-Free Manganese Catalyst Enables Selective Transfer Hydrogenation of Nitriles to Primary and Secondary Amines Using Ammonia–Borane
作者:Koushik Sarkar、Kuhali Das、Abhishek Kundu、Debashis Adhikari、Biplab Maji
DOI:10.1021/acscatal.0c05406
日期:2021.3.5
primary and secondary amines by nitrilehydrogenation, employing a borrowing hydrogenation strategy. A class of phosphine-free manganese(I) complexes bearing sulfur side arms catalyzed the reaction under mild reaction conditions, where ammonia–borane is used as the source of hydrogen. The synthetic protocol is chemodivergent, as the final product is either primary or secondary amine, which can be controlled
Diprovocims: A New and Exceptionally Potent Class of Toll-like Receptor Agonists
作者:Matthew D. Morin、Ying Wang、Brian T. Jones、Yuto Mifune、Lijing Su、Hexin Shi、Eva Marie Y. Moresco、Hong Zhang、Bruce Beutler、Dale L. Boger
DOI:10.1021/jacs.8b09223
日期:2018.10.31
from treated human THP-1 myeloid cells differentiated along the macrophage line led to the discovery of the diprovocims. Unique to these efforts and of special interest, the screening leads for this newclass of activators of an immune response came from a compound library designed to promote cell-surface receptor dimerization. Subsequent comprehensive structure-activity relationship studies improved the
Regio- and Stereoselective Hydroamination of Alkynes Using an Ammonia Surrogate: Synthesis of <i>N</i>-Silylenamines as Reactive Synthons
作者:Erica K. J. Lui、Jason W. Brandt、Laurel L. Schafer
DOI:10.1021/jacs.7b13783
日期:2018.4.18
An anti-Markovnikov selective hydroamination of alkynes with N-silylamines to afford N-silylenamines is reported. The reaction is catalyzed by a bis(amidate)bis(amido)Ti(IV) catalyst and is compatible with a variety of terminal and internal alkynes. Stoichiometric mechanistic studies were also performed. This method easily affords interesting N-silylenamine synthons in good to excellent yields and
The preparation of primary amines from nitriles has been a subject of continuing interest, and many different methods have been reported for this process. We report in this paper an alternative method for transforming nitriles into primary amines. In this work, a wide range of nitriles were reduced to primary amines by 1.2 equiv of ammonia borane under thermal decomposition conditions without any catalyst
从腈类制备伯胺一直是人们持续关注的课题,并且已经报道了许多用于该过程的不同方法。我们在本文中报告了一种将腈转化为伯胺的替代方法。在这项工作中,在没有任何催化剂的热分解条件下,通过 1.2 当量的氨硼烷将多种腈还原为伯胺,并以良好至极好的收率分离出相应的伯胺。与 H 2和 NH 3的反应对环境无害作为副产品生成。这些反应还可以容忍许多官能团。腈类可能被原位生成的氨基二硼烷还原,其在有机合成中的应用以前从未被报道过。通过使用我们的协议,成功制备了含有多氟化芳环的伯胺,这在药物合成中非常重要,很少通过催化过程制备。