Copper-Catalyzed Coupling Reaction of C−OMe Bonds Adjacent to a Nitrogen Atom with Terminal Alkynes
摘要:
The cross coupling of the C-OMe bond adjacent to a nitrogen atom in dialkoxy-N,N-dialkylmethanamines with terminal alkynes was efficiently approached in the presence of copper catalyst under mild conditions to give 3-amino-1,4-diynes in good yields. The reaction is promoted by phosphine ligands and the chemistry provides a simple and efficient route to 3-amino-1,4-diynes. Importantly, the Michael addition occurred with as-prepared 3-amino-1,4-diynes to give the useful Michael-adducts containing tert-alkylamines in a very convenient way. Further studies revealed that (E)-1,5-diarylpent-1-en-4-yn-3-one was formed through the rearrangement by using the neutral alumina column, and the corresponding imine 2-(1,5-diphenylpent-2-en-4-ynylideneamino)ethanol was obtained in the presence of AgOTf.
The Application describes disperse dyes soluble in water of general formula (I)
D-L-Sn (I)
wherein:
D is a disperse dye insoluble in water
L is a linker
S is a sugar
n is comprised between 2 and 4
that are able to dye in an homogeneous way natural fibres and textiles and also textile materials including different fibres, and have high biodegradability through digestion by micro organisms, that found in the molecule itself a useful nourishment for their survival and proliferation; processes for the preparation of the above said dyes and their use are also described.
Cu-catalyzed three-component reaction of alkyne, azides (sulfonyl or phosphoryl azides), and N,N-dialkyloxyformamide dialkyl acetal via electrophilic addition of immonium ion to copper ketenimine is reported. This new protocol for the preparation of α,β-unsaturated amidine derivatives appears to offer high yield, mild conditions, and wide substrate scope. The reaction might involve the processes of
Molecular design, synthesis and biological evaluation of cage compound-based inhibitors of hepatitis C virus p7 ion channels
作者:Vadim A. Shiryaev、Eugene V. Radchenko、Vladimir A. Palyulin、Nikolay S. Zefirov、Nikolay I. Bormotov、Olga A. Serova、Larisa N. Shishkina、Marat R. Baimuratov、Kseniya M. Bormasheva、Yulia A. Gruzd、Elena A. Ivleva、Marina V. Leonova、Anton V. Lukashenko、Dmitry V. Osipov、Vitaliy A. Osyanin、Alexander N. Reznikov、Vera A. Shadrikova、Anastasia E. Sibiryakova、Ilya M. Tkachenko、Yuri N. Klimochkin
DOI:10.1016/j.ejmech.2018.08.009
日期:2018.10
targets and having better pharmacological profile is highly desirable. The hepatitisCvirus p7 viroporin is a relatively small hydrophobic oligomeric viral ion channel that plays a critical role during virus assembly and maturation, making it an attractive and validated target for the development of the cage compound-based inhibitors. Using the homology modeling, molecular dynamics, and molecular docking
Enamine–azide [2+3]-cycloaddition as a method to introduce functional groups into fluorescent dyes
作者:Nadezhda S. Baleeva、Snizhana O. Zaitseva、Konstantin S. Mineev、Anastasia V. Khavroshechkina、Marina B. Zagudaylova、Mikhail S. Baranov
DOI:10.1016/j.tetlet.2019.01.007
日期:2019.1
functional groups into fluorescentdyes, based on the [2+3]-cycloaddition reaction of “terminal” enamines with azides. The synthesis of such “terminal” enamines is carried out by the condensation of formamide acetals with a methyl group that is influenced by a strong electron withdrawing group. Thus, the proposed functionalization technique requires only the presence of a methyl group in the relevant position
Rates of reaction of seven N,N-dialkylformamideacetals R12N–CH(OR2)2 with a series of anilinessubstituted on the phenyl ring have been measured in benzene, methanol, chloroform, and tetrahydrofuran by use of a g.l.c. method. In each case studied reaction is irreversible and obeys a second-order kinetic equation. Reactionrates correlate with Hammett σ constants for substituents on the phenyl ring