16096-13-2Relevant articles and documents
Preparation method of ortho-alkoxy substituted pyridine compound
-
Paragraph 0059-0060, (2021/09/08)
The invention provides a preparation method of an ortho-alkoxy substituted pyridine compound, the preparation method comprises the following step: reacting an ortho-amino substituted pyridine compound with an ortho-formate compound in the presence of a nitrite compound to generate the ortho-alkoxy substituted pyridine compound. The method has the advantages of high efficiency, low cost, environmental protection and the like.
Antimycobacterial cycloartane derivatives from the roots of Trichilia welwistchii C. DC (Meliaceae)
Tsamo, Armelle Tontsa,Fodja Saah, Edwige P.,Langat, Moses K.,Mkounga, Pierre,Kamdem Waffo, Alain Fran?ois,Nkengfack, Augustin Ephrem
, p. 475 - 480 (2021/08/16)
Chemical investigation of the roots of Trichilia welwitschii yielded a cycloartane type terpenoid 28,29-bis-norcycloart-24-en-3β,4α,6α-triol (1), isolated as pure compound for the first time, three coumarins and three sterols. New cycloartane derivatives (1a) and (1b+1c) were obtained by hemi-synthetic reaction of compound 1. The structures of 1a-c were established by spectroscopic methods including 1D and 2D-NMR analysis, HR-EIMS, chemical transformations and by comparison of these data with those of related compounds. Evaluated for their antimycobacterial potential, compound 1 and 1b+1c were determined to show significant activities against Mycobacterium tuberculosis MIC values of 6.25 μg mL-1 while compound 1a displayed weak activity showing MIC > 100 μg mL-1. Compounds 2-4 displayed moderate activity with MIC values range from 12.5 to 50 μg mL-1.
Highly efficient synthesis of o-(2,4-dinitrophenyl)hydroxylamine. Application to the synthesis of substituted N-benzoyliminopyridinium ylides
Legault, Claude,Charette, Andre B.
, p. 7119 - 7122 (2007/10/03)
An efficient two-step synthesis of O-(2,4-dinitrophenyl)hydroxylamine is described along with a comparison of its aminating efficiency with O-mesitylenesulfonylhydroxylamine (MSH). It was used in an expedient N-amination/benzoylation procedure involving various substituted pyridines, leading to polysubstituted N-benzoyliminopyridinium ylides, and the scope of its amination power was studied.