Molybdenum-Catalyzed Diastereoselective <i>anti</i>-Dihydroxylation of Secondary Allylic Alcohols
作者:Shixia Su、Chuan Wang
DOI:10.1021/acs.orglett.9b00735
日期:2019.4.5
In this protocol, we report a Mo-catalyzed anti-dihydroxylation of secondary allylic alcohols, providing a general method for the preparation of 1,2,3-triols bearing up to three continuous stereocenters with excellent diastereocontrol. The mechanistic studies reveal that this dihydroxylation reaction consists of two steps and up to excellent diastereomeric ratios of the final triol products can be
Although it is recognized that the presence of water is disadvantageous for imine synthesis, we demonstrate that such synthesis can be effective in completely aqueous media, without any catalyst and under mild conditions. Thus, aryl-aryl, aryl-alkyl, alkyl-aryl and alkyl-alkyl monoimines as well as a large variety of diimines are obtained by direct condensation of the corresponding carbonyl compounds and amines, in water. The same process is used to synthesize macrocyclic diimines starting from methylene, ethylene, trimethylene and tetramethylene glycol bis(2-formylphenyl ether) and ethylene-, trimethylene- and tetramethylene-diamine, some of these macrocycles being known for their chelating properties.
Competition between cyclisation and bisimine formation in the reaction of 1,3-diaminopropanes with aromatic aldehydes
作者:Julie M. Locke、Renate Griffith、Trevor D. Bailey、Robyn L. Crumbie
DOI:10.1016/j.tet.2009.10.060
日期:2009.12
Condensation of 1,3-diamines with aldehydes or ketones gives rise to two major products, the hexahydropyrimidine and the bisimine. Experimental studies of the reaction between a range of aromatic aldehydes and 1,3-diaminopropane or 1,3-diamino-2-propanol establish that the hexahydropyrimidine is favoured by the less nucleophilic amine and by the presence of electron withdrawing groups on the aryl ring
A minimalistic approach to develop new anti-apicomplexa polyamines analogs
作者:Esteban A. Panozzo-Zénere、Exequiel O.J. Porta、Gustavo Arrizabalaga、Lucía Fargnoli、Shabana I. Khan、Babu L. Tekwani、Guillermo R. Labadie
DOI:10.1016/j.ejmech.2017.11.069
日期:2018.1
The development of new chemical entities against the major diseases caused by parasites is highly desired. A library of thirty diamines analogs following a minimalist approach and supported by chemoinformatics tools have been prepared and evaluated against apicomplexan parasites. Different member of the series of N,N′-disubstituted aliphatic diamines shown in vitroactivities at submicromolar concentrations
迫切需要开发新的化学实体来对抗寄生虫引起的主要疾病。遵循极简主义方法并在化学信息学工具的支持下,已经制备了 30 个二胺类似物的文库,并针对 apicomplexan 寄生虫进行了评估。 N , N'-二取代脂肪族二胺系列的不同成员在亚微摩尔浓度下表现出体外活性,并且对弓形虫以及对氯喹敏感和耐药的恶性疟原虫菌株具有高选择性。为了证明仲胺的重要性,合成了十种N , N , N ', N'-四取代的脂肪族二胺衍生物,其活性比它们的二取代对应物低得多。进行理论研究以确定控制化合物活性的电子因素。
Synthesis and in vitro antioxidant evaluation of new bis(α-aminoalkyl)phosphinic acid derivatives
GRAPHICAL ABSTRACT ABSTRACT Diamines were added to arylaldehydes in ethanol, which resulted in corresponding diimines. Novel bis-1-aminophosphinic acid compounds were synthesized through the interaction of diimines and hypophosphorous acid. The new compounds were characterized by elemental analyses, FT-IR and 1H, 13C and 31P NMR techniques. The in vitro antioxidant activity of the newly synthesized