Asymmetric synthesis of 2-alkyl-3-phosphonopropanoic acid derivatives via Rh-catalyzed asymmetric hydrogenation
摘要:
The commercially available ferrocene-based diphosphine ligand (S-c,S-Fc)-TaniaPhos was found to be highly effective in the Rh-catalyzed asymmetric hydrogenation of 3-aryl-2-(phosphonomethyl)propenates. Excellent enantioselectivity (90-98% ee) and high catalytic activity (S/C up to 1000) have been achieved, which represents the best results reported so far. (C) 2011 Elsevier Ltd. All rights reserved.
A newclass of chiral ferrocenyl diphosphine ligands with an imidazole ring, (Rc,SFc)-ImiFerroPhos, has been prepared from acylferrocenes through a five-step transformation and successfully applied in the Rh-catalyzed asymmetric hydrogenation of various 3-aryl-substituted 2-phosphonomethylpropenoates, in which a series of chiral 3-phosphono-2-arylmethylpropanoic acid derivatives were achieved in ee
Bifunctional Lewis Base Catalyzed Asymmetric <i>N</i>-Allylic Alkylation of 2-Hydroxypyridines
作者:Fei-Ruo Zhang、Fanshu Cao、Kui Liu、Yi-Ping He、Gen Luo、Zhi-Shi Ye
DOI:10.1021/acs.orglett.2c03207
日期:2022.12.2
A chiral Lewis base catalyzed enantioselective N-allylic alkylation of 2-hydroxypyridines and MBH carbonates is documented, affording a convenientaccess to N-alkylated 2-pyridones with up to 99% ee and 99% yield. Experimental and computational studies have revealed that the strong hydrogen bond interaction between the chiral Lewis base catalyst and 2-hydroxypyridines plays a crucial role in this reaction
记录了手性路易斯碱催化的 2-羟基吡啶和 MBH 碳酸酯的对映选择性N-烯丙基烷基化,提供了一种方便地获得N-烷基化 2-吡啶酮的途径,其 ee 高达 99%,产率高达 99%。实验和计算研究表明,手性路易斯碱催化剂与 2-羟基吡啶之间的强氢键相互作用对该反应的反应性、化学选择性和对映选择性起着至关重要的作用。
Electrophilic Warhead-Based Design of Compounds Preventing NLRP3 Inflammasome-Dependent Pyroptosis
Pyroptosis is a caspase-1-dependent pro-inflammatory form of programmed cell death implicated in the pathogenesis of autoinflammatory diseases as well as in disorders characterized by excessive cell death and inflammation. Activation of NLRP3 inflammasome is a key event in the pyroptotic cascade. In this study, we describe the synthesis and chemical tuning of alpha,beta-unsaturated electrophilic warheads toward the development of antipyroptotic compounds. Their pharmacological evaluation and structure-activity relationships are also described. Compound 9 was selected as a model of this series, and it proved to be a reactive Michael acceptor, irreversibly trapping thiol nucleophiles, which prevented both ATP- and nigericin-triggered pyroptosis of human THP-1 cells in a time- and concentration-dependent manner. Moreover, 9 and other structurally related compounds, inhibited caspase-1 and NLRP3 ATPase activities. Our findings can contribute to the development of covalent, multitarget antipyroptotic compounds targeting molecular components of the NLRP3 inflammasome regulatory pathway.